Fiona left home at 9.30 a.m. and drove towards the airport which was 743 km away. For the first 204 km, she was travelling at 68 km/h. Then she increased her speed by 9 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 204 km
= 204 ÷ 68
= 3 h
Distance of the remaining journey
= 743 - 204
= 539 km
Speed for remaining journey
= 68 + 9
= 77 km/h
Time taken to travel remaining journey
= 539 ÷ 77
= 7 h
Time taken to travel the whole journey
= 7 + 3
= 10 h
(b)
10 h after 9.30 a.m. = 7.30 p.m.
Answer(s): (a) 10 h; (b) 7.30 p.m.