a motorcyclist drives from place A to B with a uniform speed of 30 km h-1 and returns from place B to A with a uniform speed of 20 km h-1 . find his average speed .
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Step-by-step explanation:
Correct option is
A
24kmh
−1
Let the length of the line segment AB be x m
The time taken is given as t=distance covered/speed
Total time = t
1
+t
2
=
30
x
+
20
x
=
60
5x
h
Average speed = Total distance/Total time =
5x/60
2x
=24 km/h
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