Betty left home at 6.20 a.m. and drove towards the airport which was 732 km away. For the first 256 km, she was travelling at 64 km/h. Then she increased her speed by 4 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 256 km
= 256 ÷ 64
= 4 h
Distance of the remaining journey
= 732 - 256
= 476 km
Speed for remaining journey
= 64 + 4
= 68 km/h
Time taken to travel remaining journey
= 476 ÷ 68
= 7 h
Time taken to travel the whole journey
= 7 + 4
= 11 h
(b)
11 h after 6.20 a.m. = 5.20 p.m.
Answer(s): (a) 11 h; (b) 5.20 p.m.