Zara left home at 10.40 a.m. and drove towards the mountain which was 788 km away. For the first 328 km, she was travelling at 82 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 328 km
= 328 ÷ 82
= 4 h
Distance of the remaining journey
= 788 - 328
= 460 km
Speed for remaining journey
= 82 + 10
= 92 km/h
Time taken to travel remaining journey
= 460 ÷ 92
= 5 h
Time taken to travel the whole journey
= 5 + 4
= 9 h
(b)
9 h after 10.40 a.m. = 7.40 p.m.
Answer(s): (a) 9 h; (b) 7.40 p.m.