Yen left home at 5.45 a.m. and drove towards the airport which was 833 km away. For the first 280 km, she was travelling at 70 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 280 km
= 280 ÷ 70
= 4 h
Distance of the remaining journey
= 833 - 280
= 553 km
Speed for remaining journey
= 70 + 9
= 79 km/h
Time taken to travel remaining journey
= 553 ÷ 79
= 7 h
Time taken to travel the whole journey
= 7 + 4
= 11 h
(b)
11 h after 5.45 a.m. = 4.45 p.m.
Answer(s): (a) 11 h; (b) 4.45 p.m.