Gwen left home at 8.10 a.m. and drove towards the city which was 775 km away. For the first 222 km, she was travelling at 74 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 222 km
= 222 ÷ 74
= 3 h
Distance of the remaining journey
= 775 - 222
= 553 km
Speed for remaining journey
= 74 + 5
= 79 km/h
Time taken to travel remaining journey
= 553 ÷ 79
= 7 h
Time taken to travel the whole journey
= 7 + 3
= 10 h
(b)
10 h after 8.10 a.m. = 6.10 p.m.
Answer(s): (a) 10 h; (b) 6.10 p.m.