At 07 25, Diana left Town J and cycled towards Town K. Jen left Town J and cycled towards Town K at 07 55. Jen's cycling speed was 2 km/h faster than Diana. At 15 25, Jen caught up with Diana. Find the cycling speed of each cyclist.
- Diana
- Jen
(a)
Duration that Jen cycled from 07 55 to 15 25
= 7
3060 = 7
12 h
Distance that Jen cycled more than Diana
= 7
12 x 2
= 15 km
However, since Diana left 30 minutes earlier than Jen and Jen caught up with Diana, it means that Diana has cycled 15 km in 30 min.
1 h = 60 min
30 min = 30 ÷ 60 =
12 h
Diana's cycling speed
= 15 ÷
12 = 15 x
21 = 30 km/h
(b)
Jen's cycling speed
= 30 + 2
= 32 km/h
Answer(s): (a) 30 km/h ; (b) 32 km/h
