At 11.50 a.m., Bryan started driving from Town E to Town F which was 310 km away. For the first 160 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 F?
(a)
Time taken for the first 160 km
= 160 ÷ 75
= 2
1075 = 2
215 h
Speed for the remaining journey
= 75 - 30
= 45 km/h
Remaining distance
= 310 - 160
= 150 km
Time taken for the remaining journey
= 150 ÷ 45
= 3
1545= 3
13 h
Total time taken
= 2
215 + 3
13= 2
215 + 3
515= 5
715 h
(b)
1 h = 60 min
715 h =
715 x 60 = 28 min
5 h 28 min after 11.50 a.m. = 5.18 p.m.
Answer(s): (a) 55
715 h; (b) 5.18 p.m.