A boy runs 20 km in 2.5 hours. How long will he take to run 32 km at double the

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A boy runs 20 km in 2.5 hours. How long will he take to run 32 km at double the previous speed ?

Options:

A . 5 hours

B . 4$1/2$ hours

C . 2$1/2$ hours

D . 2 hours

Answer: Option D
Answer: (d)Using Rule 1,The boy covers 20 km in 2.5 hours.Speed = $20/{2.5}$ = 8 km/hr.New speed = 16 km/hrTime = $32/16$ = 2 hours.

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