At 9.30 a.m., Michael started driving from Town K to Town L which was 440 km away. For the first 220 km, he travelled at an average speed of 100 km/h. He then decreased his speed by 12 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 L?
(a)
Time taken for the first 220 km
= 220 ÷ 100
= 2
20100 = 2
15 h
Speed for the remaining journey
= 100 - 12
= 88 km/h
Remaining distance
= 440 - 220
= 220 km
Time taken for the remaining journey
= 220 ÷ 88
= 2
4488= 2
12 h
Total time taken
= 2
15 + 2
12= 2
210 + 2
510= 4
710 h
(b)
1 h = 60 min
710 h =
710 x 60 = 42 min
4 h 42 min after 9.30 a.m. = 2.12 p.m.
Answer(s): (a) 44
710 h; (b) 2.12 p.m.