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A boat travel 36km upstream in …

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A boat travel 36km upstream in 5hrs. If the speed of the stream is 2.4km/hr, how much time will the boat take to cover a distance of 78km downstream?

Posted by Tanushri Bhayani 1 year, 8 months ago

CBSE > Class 12 > Applied Maths

2 answers

Preeti Dabral 1 year, 8 months ago

Distance covered by a boat in 5 hours = 36 km
Rate upstream of boat {tex}=\frac{36}{5}{/tex} 7.2 kmph
Speed of the stream = 2.4 kmph
{tex}\therefore{/tex} Speed of the boat in still water
= (7.2 + 2.4) kmph
= 9.6 kmph
{tex}\therefore{/tex} Rate downstream of the boat
= (9.6 + 2.4) kmph
= 12 kmph
{tex}\therefore{/tex} Time taken in covering 78 km distance
{tex}=\frac{78}{12}{/tex}
= 6.5 hours or 6 hour 30 minutes.

1Thank You

Tanushri Bhayani 1 year, 8 months ago

Thanks a lot dude 😇

0Thank You

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Posted by Pranav Makkar 8 months, 2 weeks ago

CBSE > Class 12 > Applied Maths