Jean left home at 7.35 a.m. and drove towards the city which was 823 km away. For the first 284 km, she was travelling at 71 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 city?
(a)
Time taken to travel 284 km
= 284 ÷ 71
= 4 h
Distance of the remaining journey
= 823 - 284
= 539 km
Speed for remaining journey
= 71 + 6
= 77 km/h
Time taken to travel remaining journey
= 539 ÷ 77
= 7 h
Time taken to travel the whole journey
= 7 + 4
= 11 h
(b)
11 h after 7.35 a.m. = 6.35 p.m.
Answer(s): (a) 11 h; (b) 6.35 p.m.