Roshel left home at 8.40 a.m. and drove towards the mountain which was 668 km away. For the first 384 km, she was travelling at 64 km/h. Then she increased her speed by 7 km/h and completed the remaining journey.
- How long did she take for her whole journey?
- At what time did she reach the mountain?
(a)
Time taken to travel 384 km
= 384 ÷ 64
= 6 h
Distance of the remaining journey
= 668 - 384
= 284 km
Speed for remaining journey
= 64 + 7
= 71 km/h
Time taken to travel remaining journey
= 284 ÷ 71
= 4 h
Time taken to travel the whole journey
= 4 + 6
= 10 h
(b)
10 h after 8.40 a.m. = 6.40 p.m.
Answer(s): (a) 10 h; (b) 6.40 p.m.