Kylie left home at 8.45 a.m. and drove towards the mountain which was 805 km away. For the first 425 km, she was travelling at 85 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 425 km
= 425 ÷ 85
= 5 h
Distance of the remaining journey
= 805 - 425
= 380 km
Speed for remaining journey
= 85 + 10
= 95 km/h
Time taken to travel remaining journey
= 380 ÷ 95
= 4 h
Time taken to travel the whole journey
= 4 + 5
= 9 h
(b)
9 h after 8.45 a.m. = 5.45 p.m.
Answer(s): (a) 9 h; (b) 5.45 p.m.