At 8.55 a.m., Ian started driving from Town V to Town W which was 320 km away. For the first 240 km, he travelled at an average speed of 75 km/h. He then decreased his speed by 27 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 W?
(a)
Time taken for the first 240 km
= 240 ÷ 75
= 3
1575 = 3
15 h
Speed for the remaining journey
= 75 - 27
= 48 km/h
Remaining distance
= 320 - 240
= 80 km
Time taken for the remaining journey
= 80 ÷ 48
= 1
3248= 1
23 h
Total time taken
= 3
15 + 1
23= 3
315 + 1
1015= 4
1315 h
(b)
1 h = 60 min
1315 h =
1315 x 60 = 52 min
4 h 52 min after 8.55 a.m. = 1.47 p.m.
Answer(s): (a) 44
1315 h; (b) 1.47 p.m.