Gillian left home at 7.20 a.m. and drove towards the mountain which was 505 km away. For the first 180 km, she was travelling at 60 km/h. Then she increased her speed by 5 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 180 km
= 180 ÷ 60
= 3 h
Distance of the remaining journey
= 505 - 180
= 325 km
Speed for remaining journey
= 60 + 5
= 65 km/h
Time taken to travel remaining journey
= 325 ÷ 65
= 5 h
Time taken to travel the whole journey
= 5 + 3
= 8 h
(b)
8 h after 7.20 a.m. = 3.20 p.m.
Answer(s): (a) 8 h; (b) 3.20 p.m.