At 10.50 a.m., Flynn started driving from Town M to Town N which was 450 km away. For the first 180 km, he travelled at an average speed of 90 km/h. He then decreased his speed by 30 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 N?
(a)
Time taken for the first 180 km
= 180 ÷ 90
= 2/1
= 2 h
Speed for the remaining journey
= 90 - 30
= 60 km/h
Remaining distance
= 450 - 180
= 270 km
Time taken for the remaining journey
= 270 ÷ 60
= 4
3060= 4
12 h
Total time taken
= 2 + 4
12= 2/1 + 4
12= 6
12 h
(b)
1 h = 60 min
12 h =
12 x 60 = 30 min
6 h 30 min after 10.50 a.m. = 5.20 p.m.
Answer(s): (a) 66
12 h; (b) 5.20 p.m.