Jaslyn left home at 5.40 a.m. and drove towards the mountain which was 658 km away. For the first 350 km, she was travelling at 70 km/h. Then she increased her speed by 7 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 350 km
= 350 ÷ 70
= 5 h
Distance of the remaining journey
= 658 - 350
= 308 km
Speed for remaining journey
= 70 + 7
= 77 km/h
Time taken to travel remaining journey
= 308 ÷ 77
= 4 h
Time taken to travel the whole journey
= 4 + 5
= 9 h
(b)
9 h after 5.40 a.m. = 2.40 p.m.
Answer(s): (a) 9 h; (b) 2.40 p.m.