# 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.