Cindy left home at 6.30 a.m. and drove towards the mountain which was 1008 km away. For the first 320 km, she was travelling at 80 km/h. Then she increased her speed by 6 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 320 km
= 320 ÷ 80
= 4 h
Distance of the remaining journey
= 1008 - 320
= 688 km
Speed for remaining journey
= 80 + 6
= 86 km/h
Time taken to travel remaining journey
= 688 ÷ 86
= 8 h
Time taken to travel the whole journey
= 8 + 4
= 12 h
(b)
12 h after 6.30 a.m. = 6.30 p.m.
Answer(s): (a) 12 h; (b) 6.30 p.m.