At 9.55 a.m., Charlie started driving from Town L to Town M which was 440 km away. For the first 240 km, he travelled at an average speed of 90 km/h. He then decreased his speed by 15 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 M?
(a)
Time taken for the first 240 km
= 240 ÷ 90
= 2
6090 = 2
23 h
Speed for the remaining journey
= 90 - 15
= 75 km/h
Remaining distance
= 440 - 240
= 200 km
Time taken for the remaining journey
= 200 ÷ 75
= 2
5075= 2
23 h
Total time taken
= 2
23 + 2
23= 2
23 + 2
23= 5
13 h
(b)
1 h = 60 min
13 h =
13 x 60 = 20 min
5 h 20 min after 9.55 a.m. = 3.15 p.m.
Answer(s): (a) 55
13 h; (b) 3.15 p.m.