Esther left home at 10.50 a.m. and drove towards the airport which was 940 km away. For the first 300 km, she was travelling at 75 km/h. Then she increased her speed by 5 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 300 km
= 300 ÷ 75
= 4 h
Distance of the remaining journey
= 940 - 300
= 640 km
Speed for remaining journey
= 75 + 5
= 80 km/h
Time taken to travel remaining journey
= 640 ÷ 80
= 8 h
Time taken to travel the whole journey
= 8 + 4
= 12 h
(b)
12 h after 10.50 a.m. = 10.50 p.m.
Answer(s): (a) 12 h; (b) 10.50 p.m.