Risa left home at 10.35 a.m. and drove towards the airport which was 505 km away. For the first 201 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 airport?
(a)
Time taken to travel 201 km
= 201 ÷ 67
= 3 h
Distance of the remaining journey
= 505 - 201
= 304 km
Speed for remaining journey
= 67 + 9
= 76 km/h
Time taken to travel remaining journey
= 304 ÷ 76
= 4 h
Time taken to travel the whole journey
= 4 + 3
= 7 h
(b)
7 h after 10.35 a.m. = 5.35 p.m.
Answer(s): (a) 7 h; (b) 5.35 p.m.