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 ?
16.7 km
18.6 km
21.5 km
26.7 km
Correct Option: D
Distance covered by A in 4 hours = 4 × 4 = 16 km Relative speed of B with respect to A = 10 – 4 = 6 km/hr ∴ Time taken to catch A