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A Car travels 30km with uniform …

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A Car travels 30km with uniform speed of 40km/h at a uniform rate of 20km/h .Find the average speed of car.

Posted by Onkar Bung 3 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Sia ? 3 years, 1 month ago

We know that, Speed=Distance / time

.°. Time =dist / speed

Let's see the first case,

s = distance = 30 km

v = speed = 40 km/hr

t = time = 30 / 40

=3/4 hrs

Let's see the second case,

s = 30 km

v = 20 km/hr

t = 30 / 20

t = 3/2 hrs

Avg. Speed =Total distance/ Total time

= (30 + 30) / (3/4) + (3/2)

= 60 / ( 3 + 6 ) /4

= 60 / 9 × 4

= 20 / 3 × 4

= 80 / 3

= 26.67 ( Approx.)

1Thank You

ANSWER

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