Joelle and Peter started off from the same place and drove at uniform speeds in the same direction round a 50 km circular racing track. Joelle completed each round in 50 minutes. Peter took 60 minutes to complete each round.
- How far would Peter be behind Joelle after 1 hour?
- How long after they started would it take Joelle to meet Peter 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
Joelle's speed
= 50 ÷
56= 50 x
65= 60 km/h
Peter's speed
= 50 ÷ 1
= 50 x
11= 50 km/h
Distance between Joelle and Peter after 1 hour
= 60 - 50
= 10 km
(b)
LCM of 50 and 60 = 300
300 min =
30060 h = 5 h
Time needed for Joelle to meet Peter for the first time = 5 h
Answer(s): (a) 10 km; (b) 5 h