Vanessa left home at 10.45 a.m. and drove towards the mountain which was 846 km away. For the first 402 km, she was travelling at 67 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 402 km
= 402 ÷ 67
= 6 h
Distance of the remaining journey
= 846 - 402
= 444 km
Speed for remaining journey
= 67 + 7
= 74 km/h
Time taken to travel remaining journey
= 444 ÷ 74
= 6 h
Time taken to travel the whole journey
= 6 + 6
= 12 h
(b)
12 h after 10.45 a.m. = 10.45 p.m.
Answer(s): (a) 12 h; (b) 10.45 p.m.