Betty left home at 8.20 a.m. and drove towards the airport which was 568 km away. For the first 264 km, she was travelling at 66 km/h. Then she increased her speed by 10 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 264 km
= 264 ÷ 66
= 4 h
Distance of the remaining journey
= 568 - 264
= 304 km
Speed for remaining journey
= 66 + 10
= 76 km/h
Time taken to travel remaining journey
= 304 ÷ 76
= 4 h
Time taken to travel the whole journey
= 4 + 4
= 8 h
(b)
8 h after 8.20 a.m. = 4.20 p.m.
Answer(s): (a) 8 h; (b) 4.20 p.m.