Yen left home at 7.30 a.m. and drove towards the airport which was 1074 km away. For the first 426 km, she was travelling at 71 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 426 km
= 426 ÷ 71
= 6 h
Distance of the remaining journey
= 1074 - 426
= 648 km
Speed for remaining journey
= 71 + 10
= 81 km/h
Time taken to travel remaining journey
= 648 ÷ 81
= 8 h
Time taken to travel the whole journey
= 8 + 6
= 14 h
(b)
14 h after 7.30 a.m. = 9.30 p.m.
Answer(s): (a) 14 h; (b) 9.30 p.m.