Wendy left home at 7.35 a.m. and drove towards the airport which was 1015 km away. For the first 375 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 375 km
= 375 ÷ 75
= 5 h
Distance of the remaining journey
= 1015 - 375
= 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 + 5
= 13 h
(b)
13 h after 7.35 a.m. = 8.35 p.m.
Answer(s): (a) 13 h; (b) 8.35 p.m.