Gillian left home at 9.30 a.m. and drove towards the mountain which was 984 km away. For the first 480 km, she was travelling at 80 km/h. Then she increased her speed by 4 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 480 km
= 480 ÷ 80
= 6 h
Distance of the remaining journey
= 984 - 480
= 504 km
Speed for remaining journey
= 80 + 4
= 84 km/h
Time taken to travel remaining journey
= 504 ÷ 84
= 6 h
Time taken to travel the whole journey
= 6 + 6
= 12 h
(b)
12 h after 9.30 a.m. = 9.30 p.m.
Answer(s): (a) 12 h; (b) 9.30 p.m.