Shannon left home at 8.30 a.m. and drove towards the airport which was 749 km away. For the first 252 km, she was travelling at 63 km/h. Then she increased her speed by 8 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 252 km
= 252 ÷ 63
= 4 h
Distance of the remaining journey
= 749 - 252
= 497 km
Speed for remaining journey
= 63 + 8
= 71 km/h
Time taken to travel remaining journey
= 497 ÷ 71
= 7 h
Time taken to travel the whole journey
= 7 + 4
= 11 h
(b)
11 h after 8.30 a.m. = 7.30 p.m.
Answer(s): (a) 11 h; (b) 7.30 p.m.