Jane left home at 7.25 a.m. and drove towards the airport which was 816 km away. For the first 384 km, she was travelling at 64 km/h. Then she increased her speed by 8 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 384 km
= 384 ÷ 64
= 6 h
Distance of the remaining journey
= 816 - 384
= 432 km
Speed for remaining journey
= 64 + 8
= 72 km/h
Time taken to travel remaining journey
= 432 ÷ 72
= 6 h
Time taken to travel the whole journey
= 6 + 6
= 12 h
(b)
12 h after 7.25 a.m. = 7.25 p.m.
Answer(s): (a) 12 h; (b) 7.25 p.m.