Jen left home at 6.40 a.m. and drove towards the mountain which was 906 km away. For the first 390 km, she was travelling at 78 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 390 km
= 390 ÷ 78
= 5 h
Distance of the remaining journey
= 906 - 390
= 516 km
Speed for remaining journey
= 78 + 8
= 86 km/h
Time taken to travel remaining journey
= 516 ÷ 86
= 6 h
Time taken to travel the whole journey
= 6 + 5
= 11 h
(b)
11 h after 6.40 a.m. = 5.40 p.m.
Answer(s): (a) 11 h; (b) 5.40 p.m.