At 5 a.m., Bobby and Justin left Park J and drove towards Park K at average speeds of 86 km/h and 50 km/h respectively. Upon reaching Park K, Bobby rested for 2 hours. He then headed back for Park J at an average speed of 86 km/h along the same route. Bobby and Justin met each other on their way at 12 noon.
- How far had Bobby covered when he met Justin on the way?
- How far apart were the two parks?
(a)
Time taken by Justin = 7 h
Time taken by Bobby = 7 - 2 = 5 h
Distance covered by Bobby when he met Justin
= 5 x 86
= 430 km
(b)
Distance travelled by Justin
= 7 x 50
= 350 km
Distance of the two parks
= (430 + 350) ÷ 2
= 780 ÷ 2
= 390 km
Answer(s): (a) 430 km; (b) 390 km
