The distance between Town T and Town U was 190 km. At 05 00, Risa left Town T and cycled towards Town U. Joelle left Town T and cycled towards Town U at 05 30. Joelle's cycling speed was 2 km/h faster than Risa. At 13 00, Joelle caught up with Risa. When Joelle was 22 km from Town U, she stopped to wait for Risa. How far was Risa from Joelle when she stopped to wait for him?
Duration in which Joelle cycled for before she caught up with Risa
= from 05 30 to 13 00
= 7 h 30 min
= 7 ³⁰₆₀ h
= 7 ¹₂ h

Distance that Joelle cycled more than Risa
= 7¹₂ x 2
= ¹⁵₂ x 2
= 5 km

Risa's cycling speed
= 5 x 2
= 10 km/h

Joelle's cycling speed
= 10 + 2
= 12 km/h

Distance that Joelle cycled before she stopped to wait for Risa
= 190 - 22
= 168 km

Duration that Joelle cycled for after she caught up with Risa and when she stopped to wait for Risa
= (168 ÷ 12) - 7¹₂
= 14 - 7¹₂
= 6¹₂ h

Distance Risa was from Joelle when she stopped to wait
= 2 x 6¹₂
= 13 km

Answer(s): 13 km