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

A boy runs 20 km in 2.5 hours. How long will he take to run 32 km at double the previous speed?
[A]5 hours
[B]4\frac{1}{2}
[C]2 hours
[D]2\frac{1}{2}

2 hours
The boy covers 20 km in 2.5 hours.
=> speed = \frac{20}{2.5} = 8 km/hr.
New speed = 16 km/hr
∴ Time = \frac{32}{16} = 2 hours.
Hence option [C] is the right answer.

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