Emily left home at 7.35 a.m. and drove towards the city which was 786 km away. For the first 330 km, she was travelling at 66 km/h. Then she increased her speed by 10 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 330 km
= 330 ÷ 66
= 5 h
Distance of the remaining journey
= 786 - 330
= 456 km
Speed for remaining journey
= 66 + 10
= 76 km/h
Time taken to travel remaining journey
= 456 ÷ 76
= 6 h
Time taken to travel the whole journey
= 6 + 5
= 11 h
(b)
11 h after 7.35 a.m. = 6.35 p.m.
Answer(s): (a) 11 h; (b) 6.35 p.m.