Gem left home at 7.35 a.m. and drove towards the city which was 805 km away. For the first 315 km, she was travelling at 63 km/h. Then she increased her speed by 7 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 315 km
= 315 ÷ 63
= 5 h
Distance of the remaining journey
= 805 - 315
= 490 km
Speed for remaining journey
= 63 + 7
= 70 km/h
Time taken to travel remaining journey
= 490 ÷ 70
= 7 h
Time taken to travel the whole journey
= 7 + 5
= 12 h
(b)
12 h after 7.35 a.m. = 7.35 p.m.
Answer(s): (a) 12 h; (b) 7.35 p.m.