Jane left home at 6.30 a.m. and drove towards the airport which was 860 km away. For the first 320 km, she was travelling at 80 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 airport?
(a)
Time taken to travel 320 km
= 320 ÷ 80
= 4 h
Distance of the remaining journey
= 860 - 320
= 540 km
Speed for remaining journey
= 80 + 10
= 90 km/h
Time taken to travel remaining journey
= 540 ÷ 90
= 6 h
Time taken to travel the whole journey
= 6 + 4
= 10 h
(b)
10 h after 6.30 a.m. = 4.30 p.m.
Answer(s): (a) 10 h; (b) 4.30 p.m.