At 11.30 a.m., Warren started driving from Town M to Town N which was 360 km away. For the first 150 km, he travelled at an average speed of 75 km/h. He then decreased his speed by 19 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 150 km
= 150 ÷ 75
= 2/1
= 2 h
Speed for the remaining journey
= 75 - 19
= 56 km/h
Remaining distance
= 360 - 150
= 210 km
Time taken for the remaining journey
= 210 ÷ 56
= 3
4256= 3
34 h
Total time taken
= 2 + 3
34= 2/1 + 3
34= 5
34 h
(b)
1 h = 60 min
34 h =
34 x 60 = 45 min
5 h 45 min after 11.30 a.m. = 5.15 p.m.
Answer(s): (a) 55
34 h; (b) 5.15 p.m.