Betty left home at 7.45 a.m. and drove towards the theme park which was 856 km away. For the first 272 km, she was travelling at 68 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 theme park?
(a)
Time taken to travel 272 km
= 272 ÷ 68
= 4 h
Distance of the remaining journey
= 856 - 272
= 584 km
Speed for remaining journey
= 68 + 5
= 73 km/h
Time taken to travel remaining journey
= 584 ÷ 73
= 8 h
Time taken to travel the whole journey
= 8 + 4
= 12 h
(b)
12 h after 7.45 a.m. = 7.45 p.m.
Answer(s): (a) 12 h; (b) 7.45 p.m.