Irene left home at 5.10 a.m. and drove towards the city which was 850 km away. For the first 325 km, she was travelling at 65 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 325 km
= 325 ÷ 65
= 5 h
Distance of the remaining journey
= 850 - 325
= 525 km
Speed for remaining journey
= 65 + 10
= 75 km/h
Time taken to travel remaining journey
= 525 ÷ 75
= 7 h
Time taken to travel the whole journey
= 7 + 5
= 12 h
(b)
12 h after 5.10 a.m. = 5.10 p.m.
Answer(s): (a) 12 h; (b) 5.10 p.m.