Diana left home at 9.10 a.m. and drove towards the city which was 800 km away. For the first 268 km, she was travelling at 67 km/h. Then she increased her speed by 9 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 268 km
= 268 ÷ 67
= 4 h
Distance of the remaining journey
= 800 - 268
= 532 km
Speed for remaining journey
= 67 + 9
= 76 km/h
Time taken to travel remaining journey
= 532 ÷ 76
= 7 h
Time taken to travel the whole journey
= 7 + 4
= 11 h
(b)
11 h after 9.10 a.m. = 8.10 p.m.
Answer(s): (a) 11 h; (b) 8.10 p.m.