PSLE
Shiyun and Barbara took part in a cycling race. Shiyun cycled at a speed of 20 km/h. Both of them did not change their speed throughout the race. When Barbara covered ¹₅ the distance, Shiyun was 5.4 km in front of her. Shiyun reached the finishing line at 9.23 a.m. What time did Barbara reach the finishing line?
If Shiyun continued to cycle until Barbara reaches the finishing point, the extra distance she covered
= 5 x 5.4
= 27 km

Time taken by Barbara to complete the race
= Time taken by Shiyun to cycle 27 km
= ²⁷₂₀ 
= 1⁷₂₀ h

1 h = 60 min
1⁷₂₀ h = 1⁷₂₀ x 60 = 81 min

81 min after 9.23 a.m.: 10.44 a.m.

Time that Barbara reached the finishing line: 10.44 a.m.

Answer(s): 10.44 a.m.