Roshel left home at 8.40 a.m. and drove towards the city which was 826 km away. For the first 474 km, she was travelling at 79 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 474 km
= 474 ÷ 79
= 6 h
Distance of the remaining journey
= 826 - 474
= 352 km
Speed for remaining journey
= 79 + 9
= 88 km/h
Time taken to travel remaining journey
= 352 ÷ 88
= 4 h
Time taken to travel the whole journey
= 4 + 6
= 10 h
(b)
10 h after 8.40 a.m. = 6.40 p.m.
Answer(s): (a) 10 h; (b) 6.40 p.m.