Joelle left home at 7.50 a.m. and drove towards the mountain which was 867 km away. For the first 384 km, she was travelling at 64 km/h. Then she increased her speed by 5 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
= 867 - 384
= 483 km
Speed for remaining journey
= 64 + 5
= 69 km/h
Time taken to travel remaining journey
= 483 ÷ 69
= 7 h
Time taken to travel the whole journey
= 7 + 6
= 13 h
(b)
13 h after 7.50 a.m. = 8.50 p.m.
Answer(s): (a) 13 h; (b) 8.50 p.m.