Julie left home at 8.25 a.m. and drove towards the airport which was 578 km away. For the first 198 km, she was travelling at 66 km/h. Then she increased her speed by 10 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 198 km
= 198 ÷ 66
= 3 h
Distance of the remaining journey
= 578 - 198
= 380 km
Speed for remaining journey
= 66 + 10
= 76 km/h
Time taken to travel remaining journey
= 380 ÷ 76
= 5 h
Time taken to travel the whole journey
= 5 + 3
= 8 h
(b)
8 h after 8.25 a.m. = 4.25 p.m.
Answer(s): (a) 8 h; (b) 4.25 p.m.