Roshel left home at 10.30 a.m. and drove towards the city which was 963 km away. For the first 243 km, she was travelling at 81 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 city?
(a)
Time taken to travel 243 km
= 243 ÷ 81
= 3 h
Distance of the remaining journey
= 963 - 243
= 720 km
Speed for remaining journey
= 81 + 9
= 90 km/h
Time taken to travel remaining journey
= 720 ÷ 90
= 8 h
Time taken to travel the whole journey
= 8 + 3
= 11 h
(b)
11 h after 10.30 a.m. = 9.30 p.m.
Answer(s): (a) 11 h; (b) 9.30 p.m.