At 9 a.m., Ian and Riordan left Park L and drove towards Park M at average speeds of 71 km/h and 64 km/h respectively. Upon reaching Park M, Ian rested for 3 hours. He then headed back for Park L at an average speed of 71 km/h along the same route. Ian and Riordan met each other on their way at 2 p.m.
- How far had Ian covered when he met Riordan on the way?
- How far apart were the two parks?
(a)
Time taken by Riordan = 5 h
Time taken by Ian = 5 - 3 = 2 h
Distance covered by Ian when he met Riordan
= 2 x 71
= 142 km
(b)
Distance travelled by Riordan
= 5 x 64
= 320 km
Distance of the two parks
= (142 + 320) ÷ 2
= 462 ÷ 2
= 231 km
Answer(s): (a) 142 km; (b) 231 km