Raeann left home at 9.30 a.m. and drove towards the mountain which was 680 km away. For the first 315 km, she was travelling at 63 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 mountain?
(a)
Time taken to travel 315 km
= 315 ÷ 63
= 5 h
Distance of the remaining journey
= 680 - 315
= 365 km
Speed for remaining journey
= 63 + 10
= 73 km/h
Time taken to travel remaining journey
= 365 ÷ 73
= 5 h
Time taken to travel the whole journey
= 5 + 5
= 10 h
(b)
10 h after 9.30 a.m. = 7.30 p.m.
Answer(s): (a) 10 h; (b) 7.30 p.m.