At 11.55 a.m., Luis started driving from Town X to Town Y which was 500 km away. For the first 200 km, he travelled at an average speed of 75 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 Y?
(a)
Time taken for the first 200 km
= 200 ÷ 75
= 2
5075 = 2
23 h
Speed for the remaining journey
= 75 - 30
= 45 km/h
Remaining distance
= 500 - 200
= 300 km
Time taken for the remaining journey
= 300 ÷ 45
= 6
3045= 6
23 h
Total time taken
= 2
23 + 6
23= 2
23 + 6
23= 9
13 h
(b)
1 h = 60 min
13 h =
13 x 60 = 20 min
9 h 20 min after 11.55 a.m. = 9.15 p.m.
Answer(s): (a) 99
13 h; (b) 9.15 p.m.