David and Riordan started jogging from the same point. Riordan started jogging 2 minutes earlier than David. David's jogging speed was 300 m/min and Riordan's jogging speed was 100 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 Riordan? 
2. What distance would Riordan have jogged when David caught up with him?  Express your answer in meters.

	David	Riordan
Speed	300 m/min	100 m/min
Start time		2 min earlier
Extra distance covered at first		200 m

(a)
Distance that Riordan covered when he jogged 2 minutes earlier
= 2 x 100
= 200 m

Distance that David covered more than Riordan per min
= 300 - 100
= 200 m

Time that David needed to take to cover the additional 200 m
= 200 ÷ 200
= 1 min

(b)
Time that Riordan would had jogged when David caught up with him
= 1 + 2
= 3 min

Distance that Riordan would have jogged when David caught up with him
= 3 x 100
= 300 m

Answer(s): (a) 1 min; (b) 300 m