Kylie left home at 9.15 a.m. and drove towards the airport which was 812 km away. For the first 231 km, she was travelling at 77 km/h. Then she increased her speed by 6 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
= 812 - 231
= 581 km
Speed for remaining journey
= 77 + 6
= 83 km/h
Time taken to travel remaining journey
= 581 ÷ 83
= 7 h
Time taken to travel the whole journey
= 7 + 3
= 10 h
(b)
10 h after 9.15 a.m. = 7.15 p.m.
Answer(s): (a) 10 h; (b) 7.15 p.m.