Yoko left home at 10.25 a.m. and drove towards the airport which was 657 km away. For the first 272 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 272 km
= 272 ÷ 68
= 4 h
Distance of the remaining journey
= 657 - 272
= 385 km
Speed for remaining journey
= 68 + 9
= 77 km/h
Time taken to travel remaining journey
= 385 ÷ 77
= 5 h
Time taken to travel the whole journey
= 5 + 4
= 9 h
(b)
9 h after 10.25 a.m. = 7.25 p.m.
Answer(s): (a) 9 h; (b) 7.25 p.m.