At 11.20 a.m., Daniel started driving from Town G to Town H which was 420 km away. For the first 240 km, he travelled at an average speed of 96 km/h. He then decreased his speed by 21 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 H?
(a)
Time taken for the first 240 km
= 240 ÷ 96
= 2
4896 = 2
12 h
Speed for the remaining journey
= 96 - 21
= 75 km/h
Remaining distance
= 420 - 240
= 180 km
Time taken for the remaining journey
= 180 ÷ 75
= 2
3075= 2
25 h
Total time taken
= 2
12 + 2
25= 2
510 + 2
410= 4
910 h
(b)
1 h = 60 min
910 h =
910 x 60 = 54 min
4 h 54 min after 11.20 a.m. = 4.14 p.m.
Answer(s): (a) 44
910 h; (b) 4.14 p.m.