Ivory left home at 9.40 a.m. and drove towards the mountain which was 767 km away. For the first 335 km, she was travelling at 67 km/h. Then she increased her speed by 5 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 335 km
= 335 ÷ 67
= 5 h
Distance of the remaining journey
= 767 - 335
= 432 km
Speed for remaining journey
= 67 + 5
= 72 km/h
Time taken to travel remaining journey
= 432 ÷ 72
= 6 h
Time taken to travel the whole journey
= 6 + 5
= 11 h
(b)
11 h after 9.40 a.m. = 8.40 p.m.
Answer(s): (a) 11 h; (b) 8.40 p.m.