At 05 25, Gillian left Town C and cycled towards Town D. Gem left Town C and cycled towards Town D at 05 55. Gem's cycling speed was 2 km/h faster than Gillian. At 11 25, Gem caught up with Gillian. Find the cycling speed of each cyclist.
- Gillian
- Gem
(a)
Duration that Gem cycled from 05 55 to 11 25
= 5
3060 = 5
12 h
Distance that Gem cycled more than Gillian
= 5
12 x 2
= 11 km
However, since Gillian left 30 minutes earlier than Gem and Gem caught up with Gillian, it means that Gillian has cycled 11 km in 30 min.
1 h = 60 min
30 min = 30 ÷ 60 =
12 h
Gillian's cycling speed
= 11 ÷
12 = 11 x
21 = 22 km/h
(b)
Gem's cycling speed
= 22 + 2
= 24 km/h
Answer(s): (a) 22 km/h ; (b) 24 km/h
