At 9.50 a.m., Liam started driving from Town C to Town D which was 440 km away. For the first 240 km, he travelled at an average speed of 75 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 D?
(a)
Time taken for the first 240 km
= 240 ÷ 75
= 3
1575 = 3
15 h
Speed for the remaining journey
= 75 - 15
= 60 km/h
Remaining distance
= 440 - 240
= 200 km
Time taken for the remaining journey
= 200 ÷ 60
= 3
2060= 3
13 h
Total time taken
= 3
15 + 3
13= 3
315 + 3
515= 6
815 h
(b)
1 h = 60 min
815 h =
815 x 60 = 32 min
6 h 32 min after 9.50 a.m. = 4.22 p.m.
Answer(s): (a) 66
815 h; (b) 4.22 p.m.