Jaslyn left home at 9.40 a.m. and drove towards the mountain which was 712 km away. For the first 408 km, she was travelling at 68 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 408 km
= 408 ÷ 68
= 6 h
Distance of the remaining journey
= 712 - 408
= 304 km
Speed for remaining journey
= 68 + 8
= 76 km/h
Time taken to travel remaining journey
= 304 ÷ 76
= 4 h
Time taken to travel the whole journey
= 4 + 6
= 10 h
(b)
10 h after 9.40 a.m. = 7.40 p.m.
Answer(s): (a) 10 h; (b) 7.40 p.m.