Xuan left home at 6.40 a.m. and drove towards the airport which was 844 km away. For the first 284 km, she was travelling at 71 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 284 km
= 284 ÷ 71
= 4 h
Distance of the remaining journey
= 844 - 284
= 560 km
Speed for remaining journey
= 71 + 9
= 80 km/h
Time taken to travel remaining journey
= 560 ÷ 80
= 7 h
Time taken to travel the whole journey
= 7 + 4
= 11 h
(b)
11 h after 6.40 a.m. = 5.40 p.m.
Answer(s): (a) 11 h; (b) 5.40 p.m.