Julie left home at 9.20 a.m. and drove towards the mountain which was 752 km away. For the first 356 km, she was travelling at 89 km/h. Then she increased her speed by 10 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 356 km
= 356 ÷ 89
= 4 h
Distance of the remaining journey
= 752 - 356
= 396 km
Speed for remaining journey
= 89 + 10
= 99 km/h
Time taken to travel remaining journey
= 396 ÷ 99
= 4 h
Time taken to travel the whole journey
= 4 + 4
= 8 h
(b)
8 h after 9.20 a.m. = 5.20 p.m.
Answer(s): (a) 8 h; (b) 5.20 p.m.