Cathy left home at 7.50 a.m. and drove towards the mountain which was 1117 km away. For the first 405 km, she was travelling at 81 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 mountain?
(a)
Time taken to travel 405 km
= 405 ÷ 81
= 5 h
Distance of the remaining journey
= 1117 - 405
= 712 km
Speed for remaining journey
= 81 + 8
= 89 km/h
Time taken to travel remaining journey
= 712 ÷ 89
= 8 h
Time taken to travel the whole journey
= 8 + 5
= 13 h
(b)
13 h after 7.50 a.m. = 8.50 p.m.
Answer(s): (a) 13 h; (b) 8.50 p.m.