Joelle left home at 7.15 a.m. and drove towards the city which was 702 km away. For the first 216 km, she was travelling at 72 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 216 km
= 216 ÷ 72
= 3 h
Distance of the remaining journey
= 702 - 216
= 486 km
Speed for remaining journey
= 72 + 9
= 81 km/h
Time taken to travel remaining journey
= 486 ÷ 81
= 6 h
Time taken to travel the whole journey
= 6 + 3
= 9 h
(b)
9 h after 7.15 a.m. = 4.15 p.m.
Answer(s): (a) 9 h; (b) 4.15 p.m.