Algebra Q#40

58Rani coveres a certain distance by car driving at 5 km/h and returns the starting point riding on a scooter at 2 km/h. Find her average speed for the whole journey.

A
B
C
D

Option : B
Explanation : Let the distance on one side be 1 km.
Average speed = 2xy/(x+y)
=(2 x 5 x 2)/(5+2) = 20/7 =

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