Question

a car covers 30km at a uniform speed 30 km/hr. what should be its speed for the next 90km if the average speed for the entire journey is 60 km​

Answer 1

Explanation:

total distance = 30 + 90 + = 120

if avg. speed is 60 km/h then total time to cover the distance is 2 hour.

avg speed = (30+X)2

distance = speed × time

120 = (30 + X)/2×2

120. = 30 + X

i.e speed = 90km/ h

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