Gwen left home at 6.10 a.m. and drove towards the airport which was 810 km away. For the first 252 km, she was travelling at 84 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 airport?
(a)
Time taken to travel 252 km
= 252 ÷ 84
= 3 h
Distance of the remaining journey
= 810 - 252
= 558 km
Speed for remaining journey
= 84 + 9
= 93 km/h
Time taken to travel remaining journey
= 558 ÷ 93
= 6 h
Time taken to travel the whole journey
= 6 + 3
= 9 h
(b)
9 h after 6.10 a.m. = 3.10 p.m.
Answer(s): (a) 9 h; (b) 3.10 p.m.