Julie left home at 6.45 a.m. and drove towards the city which was 870 km away. For the first 270 km, she was travelling at 90 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 city?
(a)
Time taken to travel 270 km
= 270 ÷ 90
= 3 h
Distance of the remaining journey
= 870 - 270
= 600 km
Speed for remaining journey
= 90 + 10
= 100 km/h
Time taken to travel remaining journey
= 600 ÷ 100
= 6 h
Time taken to travel the whole journey
= 6 + 3
= 9 h
(b)
9 h after 6.45 a.m. = 3.45 p.m.
Answer(s): (a) 9 h; (b) 3.45 p.m.