Tina left home at 5.45 a.m. and drove towards the mountain which was 680 km away. For the first 280 km, she was travelling at 70 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 280 km
= 280 ÷ 70
= 4 h
Distance of the remaining journey
= 680 - 280
= 400 km
Speed for remaining journey
= 70 + 10
= 80 km/h
Time taken to travel remaining journey
= 400 ÷ 80
= 5 h
Time taken to travel the whole journey
= 5 + 4
= 9 h
(b)
9 h after 5.45 a.m. = 2.45 p.m.
Answer(s): (a) 9 h; (b) 2.45 p.m.