Emily left home at 9.35 a.m. and drove towards the mountain which was 654 km away. For the first 270 km, she was travelling at 90 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 270 km
= 270 ÷ 90
= 3 h
Distance of the remaining journey
= 654 - 270
= 384 km
Speed for remaining journey
= 90 + 6
= 96 km/h
Time taken to travel remaining journey
= 384 ÷ 96
= 4 h
Time taken to travel the whole journey
= 4 + 3
= 7 h
(b)
7 h after 9.35 a.m. = 4.35 p.m.
Answer(s): (a) 7 h; (b) 4.35 p.m.