Penelope left home at 9.40 a.m. and drove towards the airport which was 714 km away. For the first 276 km, she was travelling at 69 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 276 km
= 276 ÷ 69
= 4 h
Distance of the remaining journey
= 714 - 276
= 438 km
Speed for remaining journey
= 69 + 4
= 73 km/h
Time taken to travel remaining journey
= 438 ÷ 73
= 6 h
Time taken to travel the whole journey
= 6 + 4
= 10 h
(b)
10 h after 9.40 a.m. = 7.40 p.m.
Answer(s): (a) 10 h; (b) 7.40 p.m.