Winnie left home at 10.10 a.m. and drove towards the airport which was 785 km away. For the first 425 km, she was travelling at 85 km/h. Then she increased her speed by 5 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 425 km
= 425 ÷ 85
= 5 h
Distance of the remaining journey
= 785 - 425
= 360 km
Speed for remaining journey
= 85 + 5
= 90 km/h
Time taken to travel remaining journey
= 360 ÷ 90
= 4 h
Time taken to travel the whole journey
= 4 + 5
= 9 h
(b)
9 h after 10.10 a.m. = 7.10 p.m.
Answer(s): (a) 9 h; (b) 7.10 p.m.