Gem left home at 5.40 a.m. and drove towards the city which was 828 km away. For the first 240 km, she was travelling at 80 km/h. Then she increased her speed by 4 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 240 km
= 240 ÷ 80
= 3 h
Distance of the remaining journey
= 828 - 240
= 588 km
Speed for remaining journey
= 80 + 4
= 84 km/h
Time taken to travel remaining journey
= 588 ÷ 84
= 7 h
Time taken to travel the whole journey
= 7 + 3
= 10 h
(b)
10 h after 5.40 a.m. = 3.40 p.m.
Answer(s): (a) 10 h; (b) 3.40 p.m.