Roshel left home at 9.40 a.m. and drove towards the city which was 681 km away. For the first 365 km, she was travelling at 73 km/h. Then she increased her speed by 6 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 365 km
= 365 ÷ 73
= 5 h
Distance of the remaining journey
= 681 - 365
= 316 km
Speed for remaining journey
= 73 + 6
= 79 km/h
Time taken to travel remaining journey
= 316 ÷ 79
= 4 h
Time taken to travel the whole journey
= 4 + 5
= 9 h
(b)
9 h after 9.40 a.m. = 6.40 p.m.
Answer(s): (a) 9 h; (b) 6.40 p.m.