Dana left home at 6.15 a.m. and drove towards the mountain which was 845 km away. For the first 213 km, she was travelling at 71 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 213 km
= 213 ÷ 71
= 3 h
Distance of the remaining journey
= 845 - 213
= 632 km
Speed for remaining journey
= 71 + 8
= 79 km/h
Time taken to travel remaining journey
= 632 ÷ 79
= 8 h
Time taken to travel the whole journey
= 8 + 3
= 11 h
(b)
11 h after 6.15 a.m. = 5.15 p.m.
Answer(s): (a) 11 h; (b) 5.15 p.m.