Marion left home at 8.40 a.m. and drove towards the mountain which was 585 km away. For the first 305 km, she was travelling at 61 km/h. Then she increased her speed by 9 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 305 km
= 305 ÷ 61
= 5 h
Distance of the remaining journey
= 585 - 305
= 280 km
Speed for remaining journey
= 61 + 9
= 70 km/h
Time taken to travel remaining journey
= 280 ÷ 70
= 4 h
Time taken to travel the whole journey
= 4 + 5
= 9 h
(b)
9 h after 8.40 a.m. = 5.40 p.m.
Answer(s): (a) 9 h; (b) 5.40 p.m.