Zara left home at 7.25 a.m. and drove towards the mountain which was 750 km away. For the first 320 km, she was travelling at 80 km/h. Then she increased her speed by 6 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 320 km
= 320 ÷ 80
= 4 h
Distance of the remaining journey
= 750 - 320
= 430 km
Speed for remaining journey
= 80 + 6
= 86 km/h
Time taken to travel remaining journey
= 430 ÷ 86
= 5 h
Time taken to travel the whole journey
= 5 + 4
= 9 h
(b)
9 h after 7.25 a.m. = 4.25 p.m.
Answer(s): (a) 9 h; (b) 4.25 p.m.