Lucy left home at 5.50 a.m. and drove towards the airport which was 1003 km away. For the first 355 km, she was travelling at 71 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 355 km
= 355 ÷ 71
= 5 h
Distance of the remaining journey
= 1003 - 355
= 648 km
Speed for remaining journey
= 71 + 10
= 81 km/h
Time taken to travel remaining journey
= 648 ÷ 81
= 8 h
Time taken to travel the whole journey
= 8 + 5
= 13 h
(b)
13 h after 5.50 a.m. = 6.50 p.m.
Answer(s): (a) 13 h; (b) 6.50 p.m.