At 09 20, Abi left Town K and cycled towards Town L. Cindy left Town K and cycled towards Town L at 09 50. Cindy's cycling speed was 4 km/h faster than Abi. At 14 20, Cindy caught up with Abi. Find the cycling speed of each cyclist.
- Abi
- Cindy
(a)
Duration that Cindy cycled from 09 50 to 14 20
= 4
3060 = 4
12 h
Distance that Cindy cycled more than Abi
= 4
12 x 4
= 18 km
However, since Abi left 30 minutes earlier than Cindy and Cindy caught up with Abi, it means that Abi has cycled 18 km in 30 min.
1 h = 60 min
30 min = 30 ÷ 60 =
12 h
Abi's cycling speed
= 18 ÷
12 = 18 x
21 = 36 km/h
(b)
Cindy's cycling speed
= 36 + 4
= 40 km/h
Answer(s): (a) 36 km/h ; (b) 40 km/h
