Lucy left home at 7.15 a.m. and drove towards the city which was 598 km away. For the first 310 km, she was travelling at 62 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 310 km
= 310 ÷ 62
= 5 h
Distance of the remaining journey
= 598 - 310
= 288 km
Speed for remaining journey
= 62 + 10
= 72 km/h
Time taken to travel remaining journey
= 288 ÷ 72
= 4 h
Time taken to travel the whole journey
= 4 + 5
= 9 h
(b)
9 h after 7.15 a.m. = 4.15 p.m.
Answer(s): (a) 9 h; (b) 4.15 p.m.