At 10.35 a.m., Japheth started driving from Town B to Town C which was 440 km away. For the first 250 km, he travelled at an average speed of 75 km/h. He then decreased his speed by 18 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 C?
(a)
Time taken for the first 250 km
= 250 ÷ 75
= 3
2575 = 3
13 h
Speed for the remaining journey
= 75 - 18
= 57 km/h
Remaining distance
= 440 - 250
= 190 km
Time taken for the remaining journey
= 190 ÷ 57
= 3
1957= 3
13 h
Total time taken
= 3
13 + 3
13= 3
13 + 3
13= 6
23 h
(b)
1 h = 60 min
23 h =
23 x 60 = 40 min
6 h 40 min after 10.35 a.m. = 5.15 p.m.
Answer(s): (a) 66
23 h; (b) 5.15 p.m.