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Let the speed of the stream be x km/hr Speed of the boat upstream=(5−x)km/hr Speed of the boat downstream=(5+x) km/hr Time taken for going 5.25km upstream = 5−x 5.25 hours Time taken for going 5.25km downstream = 5+x 5.25 hours Obviously, time taken for going 5.25km upstream is more than the time taken for going 5.25km, downstream It is given that the time taken for going 5.25km, upstream is 1 hour more than the time taken for going 5.25 downstream ∴ 5−x 5.25 − 5+x 5.25 =1 ⇒5.25{ 5−x 1 − 5+x 1 }=1⇒ 4 21 ( (5−x)(5+x) 5+x−5+x )=1 ⇒ 4 21 × 25−x 2 2x =1⇒ 2 21 × 25−x 2 x =1 ⇒2x 2 +21x−50=0 ⇒x(2x+25)−2(2x+25)=0⇒(2x+25)(x−2)=0 ⇒x−2=0,2x+25=0 ⇒x=2[∵x  = 2 −25 ] ∴ speed of the stream =2km/hr

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Com

Posted by Sujeet Maurya 3 years, 5 months ago

CBSE > Class 06 > Computer

1 answers

Sujeet Maurya 3 years, 5 months ago

Computer

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Com

Posted by Sujeet Maurya 3 years, 5 months ago

CBSE > Class 06 > Science (OLD)

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Sci

Posted by Sujeet Maurya 3 years, 5 months ago

CBSE > Class 06 > Science (OLD)

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Tiranga mere desh ki shan poem

Posted by Sarika Jangam 3 years, 5 months ago

CBSE > Class 03 > हिंदी

1 answers

Sarika Jangam 3 years, 5 months ago

Tiranga

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Write a brief note :(700-1200A.D.) a)society b) economy c) religion

Posted by Pratiksha Tripathi 3 years, 5 months ago

CBSE > Class 07 > Social Science

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What is Midrib?

Posted by A Singh 3 years, 5 months ago

CBSE > Class 06 > Science (OLD)

2 answers

Manvi Tyagi 3 years, 2 months ago

The central, thick, linear vein that runs along the length of a leaf is called midrib.

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Sujeet Maurya 3 years, 5 months ago

Pata nhi

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Posters

Posted by Daljeet Singh 3 years, 5 months ago

CBSE > Class 11 > English Core

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Factors that can affect the speed of the computer

Posted by Shovik Deepak 3 years, 5 months ago

CBSE > Class 09 > Computer Applications (165)

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What is computer security ? What should be done to keep the information secure in your computer

Posted by Harsh Kumar 3 years, 5 months ago

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Bharat ke bacche ko koi do gun likha likhit

Posted by Ayush Raj 3 years, 5 months ago

CBSE > Class 04 > हिंदी

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Explain the nation state building process in Germany after 1948

Posted by M Abitha 3 years ago

CBSE > Class 10 > Social Science

1 answers

Preeti Dabral 3 years ago

The Frankfurt Parliament, which was convented in 1848, was the first major step taken towards the unification of German states. But this liberal initiative of nation building was repressed by the combined forces of the Monarchy and big landlords of Prussia. From then Prussia took the Initiative to unify Germany.

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Calculate the electric field intensity due to an electric dipole of length 10cm consisting of 2 charge of 2 microcoulomb at a distance of 50cm from each charge.

Posted by Kalpesh Banjara 3 years, 5 months ago

CBSE > Class 12 > Physics

2 answers

Hariom Upadhyay 3 years, 5 months ago

Kq/r^3 (3cos2theta-1)

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Prabhakar Jha 3 years, 5 months ago

Product of charge

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Balu are Kahan kahan milati hai

Posted by Chahat Verma 3 years, 5 months ago

CBSE > Class 02 > Hindi

1 answers

Bhawna Bhawna 3 years, 5 months ago

Balu yaar re tere Rajasthan mein milati hai

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Where did Sara leave her ribbon

Posted by Bhawna Bhawna 3 years, 5 months ago

CBSE > Class 02 > English

1 answers

Chahat Verma 3 years, 5 months ago

Sara left the Ribbon on the table

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Where was Sara going

Posted by Bhawna Bhawna 3 years, 5 months ago

CBSE > Class 02 > English

1 answers

Chahat Verma 3 years, 5 months ago

Sara was going to out to play in the park.

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The chapter mentions 'measurable' as part of smart strategy. What do you understand by it ? How do you measure your progress?

Posted by Avni Maheshwari 3 years, 5 months ago

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India is known for its unity in diversity explain

Posted by Harsh Jain 3 years, 5 months ago

CBSE > Class 11 > Geography

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Diwali par neband

Posted by Janvi Parmar 3 years, 5 months ago

CBSE > Class 08 > हिंदी

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At room Temperature ( 27.0 ° C ) the resistance of a heating element is 1000. What is the temperature of the element if the resistance is found to be 1170 , given that the temperature co - efficient of the material of the resistor is 1.70x10 ^ -4 ° C ^ -1 .

Posted by Ankit Kumar 3 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Prabhakar Jha 3 years, 5 months ago

Change in resistance= temp. Coefficient (initial resistance+ temp. Change)

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. A parallel plate air capacitor has a capacitance of 5uF . On introducing a conducting slab of thickness equal to one fourth of the distance between the plates , what would be increase in capacity ?

Posted by Ankit Kumar 3 years, 5 months ago

CBSE > Class 12 > Physics

2 answers

Anjan Karthi 3 years, 4 months ago

What ??! No, no, no. It's not so negligible. It will have an effect, certainly. C = ε°A / (d - t + t/εr) = ε°A / (d - d/4 + d/4εr) = ε°A / (3d/4 - d/4εr).

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Kalpesh Banjara 3 years, 5 months ago

No effect, because slab thickness will be negligible which doesn't effect capacitance

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