At 08 20, Anna left Town A and cycled towards Town B. Cindy left Town A and cycled towards Town B at 08 35. Cindy's cycling speed was 4 km/h faster than Anna. At 10 20, Cindy caught up with Anna. Find the cycling speed of each cyclist.
- Anna
- Cindy
(a)
Duration that Cindy cycled from 08 35 to 10 20
= 1
4560 = 1
34 h
Distance that Cindy cycled more than Anna
= 1
34 x 4
= 7 km
However, since Anna left 15 minutes earlier than Cindy and Cindy caught up with Anna, it means that Anna has cycled 7 km in 15 min.
1 h = 60 min
15 min = 15 ÷ 60 =
14 h
Anna's cycling speed
= 7 ÷
14 = 7 x
41 = 28 km/h
(b)
Cindy's cycling speed
= 28 + 4
= 32 km/h
Answer(s): (a) 28 km/h ; (b) 32 km/h
