David and Rael started jogging from the same point. Rael started jogging 9 minutes earlier than David. David's jogging speed was 400 m/min and Rael's jogging speed was 200 m/min. They went in the same direction and did not change their speeds throughout.

1. How long did it take for David to catch up with Rael? 
2. What distance would Rael have jogged when David caught up with him?  Express your answer in meters.

	David	Rael
Speed	400 m/min	200 m/min
Start time		9 min earlier
Extra distance covered at first		1800 m

(a)
Distance that Rael covered when he jogged 9 minutes earlier
= 9 x 200
= 1800 m

Distance that David covered more than Rael per min
= 400 - 200
= 200 m

Time that David needed to take to cover the additional 1800 m
= 1800 ÷ 200
= 9 min

(b)
Time that Rael would had jogged when David caught up with him
= 9 + 9
= 18 min

Distance that Rael would have jogged when David caught up with him
= 18 x 200
= 3600 m

Answer(s): (a) 9 min; (b) 3600 m