Lucy left home at 10.40 a.m. and drove towards the mountain which was 1030 km away. For the first 540 km, she was travelling at 90 km/h. Then she increased her speed by 8 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 540 km
= 540 ÷ 90
= 6 h
Distance of the remaining journey
= 1030 - 540
= 490 km
Speed for remaining journey
= 90 + 8
= 98 km/h
Time taken to travel remaining journey
= 490 ÷ 98
= 5 h
Time taken to travel the whole journey
= 5 + 6
= 11 h
(b)
11 h after 10.40 a.m. = 9.40 p.m.
Answer(s): (a) 11 h; (b) 9.40 p.m.