A car travels at a speed of 10km/h in 1 hour, 20km/h in 2
hours and 30km/h in 3 hours. Find the average speed of the
car.'
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eed and Velocity
A car travels from A to B a...
PHYSICS
A car travels from A to B at a, speed of 20kmh
−1
and returns at a speed of 30kmh
−1
. The average speed of the car for the whole journey is:
MEDIUM
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ANSWER
Let distance from A to B be x
Time for travel from A to B= x/20
Time for travel from B to A= x/30
Hence,speed for total distance 2x is:
30
x
+
20
x
2x
=
5x
2x×60
=24 km\hr
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