Sabrina left home at 10.30 a.m. and drove towards the city which was 1200 km away. For the first 480 km, she was travelling at 80 km/h. Then she increased her speed by 10 km/h and completed the remaining journey.
- How long did she take for her whole journey?
- At what time did she reach the city?
(a)
Time taken to travel 480 km
= 480 ÷ 80
= 6 h
Distance of the remaining journey
= 1200 - 480
= 720 km
Speed for remaining journey
= 80 + 10
= 90 km/h
Time taken to travel remaining journey
= 720 ÷ 90
= 8 h
Time taken to travel the whole journey
= 8 + 6
= 14 h
(b)
14 h after 10.30 a.m. = 12.30 p.m.
Answer(s): (a) 14 h; (b) 12.30 p.m.