Risa left home at 6.25 a.m. and drove towards the city which was 872 km away. For the first 504 km, she was travelling at 84 km/h. Then she increased her speed by 8 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 504 km
= 504 ÷ 84
= 6 h
Distance of the remaining journey
= 872 - 504
= 368 km
Speed for remaining journey
= 84 + 8
= 92 km/h
Time taken to travel remaining journey
= 368 ÷ 92
= 4 h
Time taken to travel the whole journey
= 4 + 6
= 10 h
(b)
10 h after 6.25 a.m. = 4.25 p.m.
Answer(s): (a) 10 h; (b) 4.25 p.m.