Victoria left home at 10.35 a.m. and drove towards the mountain which was 749 km away. For the first 324 km, she was travelling at 81 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 324 km
= 324 ÷ 81
= 4 h
Distance of the remaining journey
= 749 - 324
= 425 km
Speed for remaining journey
= 81 + 4
= 85 km/h
Time taken to travel remaining journey
= 425 ÷ 85
= 5 h
Time taken to travel the whole journey
= 5 + 4
= 9 h
(b)
9 h after 10.35 a.m. = 7.35 p.m.
Answer(s): (a) 9 h; (b) 7.35 p.m.