If a man takes 4 hours to cover a distance of 15 km. how

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If a man takes 4 hours to cover a distance of 15 km. how much time will be needed to cover 63 km. at the same speed ?

1. 12 hrs. 36 min.
2. 16 hrs. 48 min.
3. 16 hrs. 4 min.
4. 15 hrs. 32 min.

Correct Option: B

Required time = (4 / 15) x 63 hrs.
= 16 hrs. 48 min