Sarah left home at 5.15 a.m. and drove towards the city which was 694 km away. For the first 370 km, she was travelling at 74 km/h. Then she increased her speed by 7 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 370 km
= 370 ÷ 74
= 5 h
Distance of the remaining journey
= 694 - 370
= 324 km
Speed for remaining journey
= 74 + 7
= 81 km/h
Time taken to travel remaining journey
= 324 ÷ 81
= 4 h
Time taken to travel the whole journey
= 4 + 5
= 9 h
(b)
9 h after 5.15 a.m. = 2.15 p.m.
Answer(s): (a) 9 h; (b) 2.15 p.m.