Yen left home at 9.20 a.m. and drove towards the city which was 1023 km away. For the first 456 km, she was travelling at 76 km/h. Then she increased her speed by 5 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 456 km
= 456 ÷ 76
= 6 h
Distance of the remaining journey
= 1023 - 456
= 567 km
Speed for remaining journey
= 76 + 5
= 81 km/h
Time taken to travel remaining journey
= 567 ÷ 81
= 7 h
Time taken to travel the whole journey
= 7 + 6
= 13 h
(b)
13 h after 9.20 a.m. = 10.20 p.m.
Answer(s): (a) 13 h; (b) 10.20 p.m.