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
1). 2 hours
2). $2\frac{1}{2}$ hours
3). $4\frac{1}{2}$ hours
4). 5 hours

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