A motorcyclist drives from place A to B with a uniform speed of 30 km-h and return from place B to A with a uniform speed of 20 km-h . Find his average speed.
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12
Answer:
Explanations. Let the distance be x. Speed=distance/time so time=distance/speed. Time 1 = x/20. Time 2 = x/30. Now total distance =2x and total time = x/20+x/30 = 5x/60=x/12. Average speed= total distance/total time. So 2x/(x/12)=(2x/x)*12=12*2=24km/h
Answered by
0
Answer:
24 km/hr
Explanation:
Let the distance from A to B is D km
Total Distance Covered = 2D
Total Time Taken = D/30 + D/20 = D/12
Average speed = Total Distance Covered / Total Time Taken
= 2D / (D/12)
= 2D * 12/D
= 2*12 = 24 km/h
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