Gwen left home at 6.15 a.m. and drove towards the city which was 822 km away. For the first 432 km, she was travelling at 72 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 432 km
= 432 ÷ 72
= 6 h
Distance of the remaining journey
= 822 - 432
= 390 km
Speed for remaining journey
= 72 + 6
= 78 km/h
Time taken to travel remaining journey
= 390 ÷ 78
= 5 h
Time taken to travel the whole journey
= 5 + 6
= 11 h
(b)
11 h after 6.15 a.m. = 5.15 p.m.
Answer(s): (a) 11 h; (b) 5.15 p.m.