Nora left home at 9.30 a.m. and drove towards the city which was 790 km away. For the first 450 km, she was travelling at 75 km/h. Then she increased her speed by 10 km/h and completed the remaining journey.
- How long did she take for her whole journey?
- At what time did she reach the city?
(a)
Time taken to travel 450 km
= 450 ÷ 75
= 6 h
Distance of the remaining journey
= 790 - 450
= 340 km
Speed for remaining journey
= 75 + 10
= 85 km/h
Time taken to travel remaining journey
= 340 ÷ 85
= 4 h
Time taken to travel the whole journey
= 4 + 6
= 10 h
(b)
10 h after 9.30 a.m. = 7.30 p.m.
Answer(s): (a) 10 h; (b) 7.30 p.m.