Julie left home at 9.50 a.m. and drove towards the airport which was 567 km away. For the first 231 km, she was travelling at 77 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 airport?
(a)
Time taken to travel 231 km
= 231 ÷ 77
= 3 h
Distance of the remaining journey
= 567 - 231
= 336 km
Speed for remaining journey
= 77 + 7
= 84 km/h
Time taken to travel remaining journey
= 336 ÷ 84
= 4 h
Time taken to travel the whole journey
= 4 + 3
= 7 h
(b)
7 h after 9.50 a.m. = 4.50 p.m.
Answer(s): (a) 7 h; (b) 4.50 p.m.