Ivory left home at 8.35 a.m. and drove towards the city which was 906 km away. For the first 438 km, she was travelling at 73 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 city?
(a)
Time taken to travel 438 km
= 438 ÷ 73
= 6 h
Distance of the remaining journey
= 906 - 438
= 468 km
Speed for remaining journey
= 73 + 5
= 78 km/h
Time taken to travel remaining journey
= 468 ÷ 78
= 6 h
Time taken to travel the whole journey
= 6 + 6
= 12 h
(b)
12 h after 8.35 a.m. = 8.35 p.m.
Answer(s): (a) 12 h; (b) 8.35 p.m.