At 10.35 a.m., Ahmad started driving from Town L to Town M which was 320 km away. For the first 180 km, he travelled at an average speed of 80 km/h. He then decreased his speed by 24 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 180 km
= 180 ÷ 80
= 2
2080 = 2
14 h
Speed for the remaining journey
= 80 - 24
= 56 km/h
Remaining distance
= 320 - 180
= 140 km
Time taken for the remaining journey
= 140 ÷ 56
= 2
2856= 2
12 h
Total time taken
= 2
14 + 2
12= 2
14 + 2
24= 4
34 h
(b)
1 h = 60 min
34 h =
34 x 60 = 45 min
4 h 45 min after 10.35 a.m. = 3.20 p.m.
Answer(s): (a) 44
34 h; (b) 3.20 p.m.