Cathy left home at 8.30 a.m. and drove towards the city which was 705 km away. For the first 225 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 city?
(a)
Time taken to travel 225 km
= 225 ÷ 75
= 3 h
Distance of the remaining journey
= 705 - 225
= 480 km
Speed for remaining journey
= 75 + 5
= 80 km/h
Time taken to travel remaining journey
= 480 ÷ 80
= 6 h
Time taken to travel the whole journey
= 6 + 3
= 9 h
(b)
9 h after 8.30 a.m. = 5.30 p.m.
Answer(s): (a) 9 h; (b) 5.30 p.m.