Betty left home at 10.20 a.m. and drove towards the airport which was 483 km away. For the first 195 km, she was travelling at 65 km/h. Then she increased her speed by 7 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 195 km
= 195 ÷ 65
= 3 h
Distance of the remaining journey
= 483 - 195
= 288 km
Speed for remaining journey
= 65 + 7
= 72 km/h
Time taken to travel remaining journey
= 288 ÷ 72
= 4 h
Time taken to travel the whole journey
= 4 + 3
= 7 h
(b)
7 h after 10.20 a.m. = 5.20 p.m.
Answer(s): (a) 7 h; (b) 5.20 p.m.