Gillian left home at 8.20 a.m. and drove towards the city which was 904 km away. For the first 474 km, she was travelling at 79 km/h. Then she increased her speed by 7 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
= 904 - 474
= 430 km
Speed for remaining journey
= 79 + 7
= 86 km/h
Time taken to travel remaining journey
= 430 ÷ 86
= 5 h
Time taken to travel the whole journey
= 5 + 6
= 11 h
(b)
11 h after 8.20 a.m. = 7.20 p.m.
Answer(s): (a) 11 h; (b) 7.20 p.m.