At 05 25, Ivory left Town W and cycled towards Town X. Lynn left Town W and cycled towards Town X at 05 55. Lynn's cycling speed was 4 km/h faster than Ivory. At 10 25, Lynn caught up with Ivory. Find the cycling speed of each cyclist.
- Ivory
- Lynn
(a)
Duration that Lynn cycled from 05 55 to 10 25
= 4
3060 = 4
12 h
Distance that Lynn cycled more than Ivory
= 4
12 x 4
= 18 km
However, since Ivory left 30 minutes earlier than Lynn and Lynn caught up with Ivory, it means that Ivory has cycled 18 km in 30 min.
1 h = 60 min
30 min = 30 ÷ 60 =
12 h
Ivory's cycling speed
= 18 ÷
12 = 18 x
21 = 36 km/h
(b)
Lynn's cycling speed
= 36 + 4
= 40 km/h
Answer(s): (a) 36 km/h ; (b) 40 km/h
