At 11.30 a.m., Peter started driving from Town M to Town N which was 300 km away. For the first 210 km, he travelled at an average speed of 72 km/h. He then decreased his speed by 22 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 N?
(a)
Time taken for the first 210 km
= 210 ÷ 72
= 2
6672 = 2
1112 h
Speed for the remaining journey
= 72 - 22
= 50 km/h
Remaining distance
= 300 - 210
= 90 km
Time taken for the remaining journey
= 90 ÷ 50
= 1
4050= 1
45 h
Total time taken
= 2
1112 + 1
45= 2
5560 + 1
4860= 4
4360 h
(b)
1 h = 60 min
4360 h =
4360 x 60 = 43 min
4 h 43 min after 11.30 a.m. = 4.13 p.m.
Answer(s): (a) 44
4360 h; (b) 4.13 p.m.