At 9.45 a.m., Reggie started driving from Town E to Town F which was 480 km away. For the first 150 km, he travelled at an average speed of 72 km/h. He then decreased his speed by 22 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 F?
(a)
Time taken for the first 150 km
= 150 ÷ 72
= 2
672 = 2
112 h
Speed for the remaining journey
= 72 - 22
= 50 km/h
Remaining distance
= 480 - 150
= 330 km
Time taken for the remaining journey
= 330 ÷ 50
= 6
3050= 6
35 h
Total time taken
= 2
112 + 6
35= 2
560 + 6
3660= 8
4160 h
(b)
1 h = 60 min
4160 h =
4160 x 60 = 41 min
8 h 41 min after 9.45 a.m. = 6.26 p.m.
Answer(s): (a) 88
4160 h; (b) 6.26 p.m.