Cindy left home at 7.30 a.m. and drove towards the mountain which was 916 km away. For the first 340 km, she was travelling at 68 km/h. Then she increased her speed by 4 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 340 km
= 340 ÷ 68
= 5 h
Distance of the remaining journey
= 916 - 340
= 576 km
Speed for remaining journey
= 68 + 4
= 72 km/h
Time taken to travel remaining journey
= 576 ÷ 72
= 8 h
Time taken to travel the whole journey
= 8 + 5
= 13 h
(b)
13 h after 7.30 a.m. = 8.30 p.m.
Answer(s): (a) 13 h; (b) 8.30 p.m.