Barbara left home at 6.45 a.m. and drove towards the airport which was 663 km away. For the first 180 km, she was travelling at 60 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 180 km
= 180 ÷ 60
= 3 h
Distance of the remaining journey
= 663 - 180
= 483 km
Speed for remaining journey
= 60 + 9
= 69 km/h
Time taken to travel remaining journey
= 483 ÷ 69
= 7 h
Time taken to travel the whole journey
= 7 + 3
= 10 h
(b)
10 h after 6.45 a.m. = 4.45 p.m.
Answer(s): (a) 10 h; (b) 4.45 p.m.