Gabby left home at 8.30 a.m. and drove towards the airport which was 608 km away. For the first 288 km, she was travelling at 72 km/h. Then she increased her speed by 8 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 288 km
= 288 ÷ 72
= 4 h
Distance of the remaining journey
= 608 - 288
= 320 km
Speed for remaining journey
= 72 + 8
= 80 km/h
Time taken to travel remaining journey
= 320 ÷ 80
= 4 h
Time taken to travel the whole journey
= 4 + 4
= 8 h
(b)
8 h after 8.30 a.m. = 4.30 p.m.
Answer(s): (a) 8 h; (b) 4.30 p.m.