A man goes to a place on bicycle at speed of 16 km/hr and comes back at lower speed. If the average speed is 6.4 km/hr in total journey, then the return speed (in km/hr) is :

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A man goes to a place on bicycle at speed of 16 km/hr and comes back at lower speed. If the average speed is 6.4 km/hr in total journey, then the return speed (in km/hr) is :

A10

Answer:

D. 4

Read Explanation:

Average speed : = 2xy/x+y =2×16×y/16+y 6.4=32y/16+y 102.4+6.4=32y ⇒102.4=25.6y ⇒y=102.4/25.6 ⇒y=4 km/hr

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