At 06 10, Risa left Town G and cycled towards Town H. Tiffany left Town G and cycled towards Town H at 06 50. Tiffany's cycling speed was 6 km/h faster than Risa. At 10 10, Tiffany caught up with Risa. Find the cycling speed of each cyclist.

1. Risa
2. Tiffany

(a)
Duration that Tiffany cycled from 06 50 to 10 10
= 3²⁰₆₀
= 3¹₃ h

Distance that Tiffany cycled more than Risa
= 3¹₃ x 6
= 20 km

However, since Risa left 40 minutes earlier than Tiffany and Tiffany caught up with Risa, it means that Risa has cycled 20 km in 40 min.

1 h = 60 min 
40 min = 40 ÷ 60 = ²₃ h

Risa's cycling speed
= 20 ÷ ²₃
= 20 x ³₂
= 30 km/h

(b)
Tiffany's cycling speed
= 30 + 6
= 36 km/h

Answer(s): (a) 30 km/h ; (b) 36 km/h