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\ k m` b. `18. 6\ k m` c. `21. 5\ k m` d. `26. 7\ k m`

Ravi walks to and fro to a shopping mall. He spends 30 minutes shopping. If he walks at a speed of km an hour, he returns home at 19.00 hours. If walks at 15 kin an hour, he returns home at 18.30 hours. How far must he walk in order to ret hours home at 18.15 hours? 17 k m//h r b. 18 k m//h r c. 19 k m//h r d. 17. 5 k m//h r e. none of these

A man goes 24m due west and then 7m due north.How far is he from the starting point? (a) 31m (b) 17m(c)25m(d)26m