Jen left home at 5.45 a.m. and drove towards the mountain which was 860 km away. For the first 420 km, she was travelling at 84 km/h. Then she increased her speed by 4 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 420 km
= 420 ÷ 84
= 5 h
Distance of the remaining journey
= 860 - 420
= 440 km
Speed for remaining journey
= 84 + 4
= 88 km/h
Time taken to travel remaining journey
= 440 ÷ 88
= 5 h
Time taken to travel the whole journey
= 5 + 5
= 10 h
(b)
10 h after 5.45 a.m. = 3.45 p.m.
Answer(s): (a) 10 h; (b) 3.45 p.m.