At 11.55 a.m., Pierre started driving from Town C to Town D which was 300 km away. For the first 170 km, he travelled at an average speed of 75 km/h. He then decreased his speed by 25 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 D?
(a)
Time taken for the first 170 km
= 170 ÷ 75
= 2
2075 = 2
415 h
Speed for the remaining journey
= 75 - 25
= 50 km/h
Remaining distance
= 300 - 170
= 130 km
Time taken for the remaining journey
= 130 ÷ 50
= 2
3050= 2
35 h
Total time taken
= 2
415 + 2
35= 2
415 + 2
915= 4
1315 h
(b)
1 h = 60 min
1315 h =
1315 x 60 = 52 min
4 h 52 min after 11.55 a.m. = 4.47 p.m.
Answer(s): (a) 44
1315 h; (b) 4.47 p.m.