A walks at a uniform rate of 4 km an hour, and 4 hours after his start, B bicycles after him at the uniform rate of 10 km an hour. How far from the starting point will B catch A

A walks at a uniform rate of 4 km an hour, and 4 hours after his start, B bicycles after him at the uniform rate of 10 km an hour. How far from the starting point will B catch A
1). 16.7 km
2). 18.6 km
3). 21.5 km
4). 26.7 km

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