At 11.35 a.m., Ben started driving from Town B to Town C which was 480 km away. For the first 210 km, he travelled at an average speed of 100 km/h. He then decreased his speed by 28 km/h and completed the remaining journey.
- Find the total time taken for the whole journey. Express your answer as a mixed number.
- At what time did she reach Town C?
(a)
Time taken for the first 210 km
= 210 ÷ 100
= 2
10100 = 2
110 h
Speed for the remaining journey
= 100 - 28
= 72 km/h
Remaining distance
= 480 - 210
= 270 km
Time taken for the remaining journey
= 270 ÷ 72
= 3
5472= 3
34 h
Total time taken
= 2
110 + 3
34= 2
220 + 3
1520= 5
1720 h
(b)
1 h = 60 min
1720 h =
1720 x 60 = 51 min
5 h 51 min after 11.35 a.m. = 5.26 p.m.
Answer(s): (a) 55
1720 h; (b) 5.26 p.m.