At 8 a.m., Riordan and Mark left Park R and drove towards Park S at average speeds of 91 km/h and 64 km/h respectively. Upon reaching Park S, Riordan rested for 2 hours. He then headed back for Park R at an average speed of 91 km/h along the same route. Riordan and Mark met each other on their way at 2 p.m.
- How far had Riordan covered when he met Mark on the way?
- How far apart were the two parks?
(a)
Time taken by Mark = 6 h
Time taken by Riordan = 6 - 2 = 4 h
Distance covered by Riordan when he met Mark
= 4 x 91
= 364 km
(b)
Distance travelled by Mark
= 6 x 64
= 384 km
Distance of the two parks
= (364 + 384) ÷ 2
= 748 ÷ 2
= 374 km
Answer(s): (a) 364 km; (b) 374 km