Jean left home at 10.15 a.m. and drove towards the mountain which was 946 km away. For the first 365 km, she was travelling at 73 km/h. Then she increased her speed by 10 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 365 km
= 365 ÷ 73
= 5 h
Distance of the remaining journey
= 946 - 365
= 581 km
Speed for remaining journey
= 73 + 10
= 83 km/h
Time taken to travel remaining journey
= 581 ÷ 83
= 7 h
Time taken to travel the whole journey
= 7 + 5
= 12 h
(b)
12 h after 10.15 a.m. = 10.15 p.m.
Answer(s): (a) 12 h; (b) 10.15 p.m.