Emma left home at 6.40 a.m. and drove towards the airport which was 670 km away. For the first 325 km, she was travelling at 65 km/h. Then she increased her speed by 4 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 325 km
= 325 ÷ 65
= 5 h
Distance of the remaining journey
= 670 - 325
= 345 km
Speed for remaining journey
= 65 + 4
= 69 km/h
Time taken to travel remaining journey
= 345 ÷ 69
= 5 h
Time taken to travel the whole journey
= 5 + 5
= 10 h
(b)
10 h after 6.40 a.m. = 4.40 p.m.
Answer(s): (a) 10 h; (b) 4.40 p.m.