PSLE
Olivia and Shannon took part in a cycling race. Olivia cycled at a speed of 18 km/h. Both of them did not change their speed throughout the race. When Shannon covered ¹₅ the distance, Olivia was 4.2 km in front of her. Olivia reached the finishing line at 9.21 a.m. What time did Shannon reach the finishing line?
If Olivia continued to cycle until Shannon reaches the finishing point, the extra distance she covered
= 5 x 4.2
= 21 km

Time taken by Shannon to complete the race
= Time taken by Olivia to cycle 21 km
= ²¹₁₈ 
= 1¹₆ h

1 h = 60 min
1¹₆ h = 1¹₆ x 60 = 70 min

70 min after 9.21 a.m.: 10.31 a.m.

Time that Shannon reached the finishing line: 10.31 a.m.

Answer(s): 10.31 a.m.