Kimberly left home at 7.25 a.m. and drove towards the airport which was 457 km away. For the first 189 km, she was travelling at 63 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 189 km
= 189 ÷ 63
= 3 h
Distance of the remaining journey
= 457 - 189
= 268 km
Speed for remaining journey
= 63 + 4
= 67 km/h
Time taken to travel remaining journey
= 268 ÷ 67
= 4 h
Time taken to travel the whole journey
= 4 + 3
= 7 h
(b)
7 h after 7.25 a.m. = 2.25 p.m.
Answer(s): (a) 7 h; (b) 2.25 p.m.