Erika left home at 5.50 a.m. and drove towards the airport which was 806 km away. For the first 336 km, she was travelling at 84 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 airport?
(a)
Time taken to travel 336 km
= 336 ÷ 84
= 4 h
Distance of the remaining journey
= 806 - 336
= 470 km
Speed for remaining journey
= 84 + 10
= 94 km/h
Time taken to travel remaining journey
= 470 ÷ 94
= 5 h
Time taken to travel the whole journey
= 5 + 4
= 9 h
(b)
9 h after 5.50 a.m. = 2.50 p.m.
Answer(s): (a) 9 h; (b) 2.50 p.m.