Sarah left home at 8.30 a.m. and drove towards the airport which was 1083 km away. For the first 425 km, she was travelling at 85 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 425 km
= 425 ÷ 85
= 5 h
Distance of the remaining journey
= 1083 - 425
= 658 km
Speed for remaining journey
= 85 + 9
= 94 km/h
Time taken to travel remaining journey
= 658 ÷ 94
= 7 h
Time taken to travel the whole journey
= 7 + 5
= 12 h
(b)
12 h after 8.30 a.m. = 8.30 p.m.
Answer(s): (a) 12 h; (b) 8.30 p.m.