Jen left home at 7.45 a.m. and drove towards the mountain which was 705 km away. For the first 300 km, she was travelling at 75 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 300 km
= 300 ÷ 75
= 4 h
Distance of the remaining journey
= 705 - 300
= 405 km
Speed for remaining journey
= 75 + 6
= 81 km/h
Time taken to travel remaining journey
= 405 ÷ 81
= 5 h
Time taken to travel the whole journey
= 5 + 4
= 9 h
(b)
9 h after 7.45 a.m. = 4.45 p.m.
Answer(s): (a) 9 h; (b) 4.45 p.m.