Question

a car travels from place a to b at 20 km/hour and returns at 30 km/hour the average speed of car for whole journey is​

Answer 1

average speed=(u+v)/2
(20+30)/2
25 answer
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Answer 2

Explanation:

Let the distance = x

Total distance =x+x

=2x

time for 1st journey = t1 = distance / speed

t1 = x / 20

Time for 2nd journey = t2 = distance / speed

t2 = x / 30

Total time = t1 + t2

= x / 20 + x / 30

=(3x+2x)/60

5x /60

Average speed = Total distance / Total time

= 2x / 5x / 60

= 2x × 60 / 5 x

=24km / h

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