At 11.40 a.m., Vincent started driving from Town X to Town Y which was 370 km away. For the first 160 km, he travelled at an average speed of 80 km/h. He then decreased his speed by 8 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 Y?
(a)
Time taken for the first 160 km
= 160 ÷ 80
= 2/1
= 2 h
Speed for the remaining journey
= 80 - 8
= 72 km/h
Remaining distance
= 370 - 160
= 210 km
Time taken for the remaining journey
= 210 ÷ 72
= 2
6672= 2
1112 h
Total time taken
= 2 + 2
1112= 2/1 + 2
1112= 4
1112 h
(b)
1 h = 60 min
1112 h =
1112 x 60 = 55 min
4 h 55 min after 11.40 a.m. = 4.35 p.m.
Answer(s): (a) 44
1112 h; (b) 4.35 p.m.