Julie and Will started off from the same place and drove at uniform speeds in the same direction round a 45 km circular racing track. Julie completed each round in 50 minutes. Will took 60 minutes to complete each round.
- How far would Will be behind Julie after 1 hour?
- How long after they started would it take Julie to meet Will for the first time? Express your answer as a whole or mixed number in h.
(a)
60 min = 1 h
1 min =
160 h
50 min =
5060 h =
56 h
60 min =
6060 h = 1 h
Julie's speed
= 45 ÷
56= 45 x
65= 54 km/h
Will's speed
= 45 ÷ 1
= 45 x
11= 45 km/h
Distance between Julie and Will after 1 hour
= 54 - 45
= 9 km
(b)
LCM of 50 and 60 = 300
300 min =
30060 h = 5 h
Time needed for Julie to meet Will for the first time = 5 h
Answer(s): (a) 9 km; (b) 5 h