Min left home at 10.30 a.m. and drove towards the mountain which was 1086 km away. For the first 522 km, she was travelling at 87 km/h. Then she increased her speed by 7 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 522 km
= 522 ÷ 87
= 6 h
Distance of the remaining journey
= 1086 - 522
= 564 km
Speed for remaining journey
= 87 + 7
= 94 km/h
Time taken to travel remaining journey
= 564 ÷ 94
= 6 h
Time taken to travel the whole journey
= 6 + 6
= 12 h
(b)
12 h after 10.30 a.m. = 10.30 p.m.
Answer(s): (a) 12 h; (b) 10.30 p.m.