PSLE
Xandra and Kimberly took part in a cycling race. Xandra cycled at a speed of 36 km/h. Both of them did not change their speed throughout the race. When Kimberly covered ¹₅ the distance, Xandra was 4.2 km in front of her. Xandra reached the finishing line at 8.45 a.m. What time did Kimberly reach the finishing line?
If Xandra continued to cycle until Kimberly reaches the finishing point, the extra distance she covered
= 5 x 4.2
= 21 km

Time taken by Kimberly to complete the race
= Time taken by Xandra to cycle 21 km
= ²¹₃₆ 
= ⁷₁₂ h

1 h = 60 min
⁷₁₂ h = ⁷₁₂ x 60 = 35 min

35 min after 8.45 a.m.: 9.20 a.m.

Time that Kimberly reached the finishing line: 9.20 a.m.

Answer(s): 9.20 a.m.