Gillian left home at 6.35 a.m. and drove towards the mountain which was 710 km away. For the first 414 km, she was travelling at 69 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 mountain?
(a)
Time taken to travel 414 km
= 414 ÷ 69
= 6 h
Distance of the remaining journey
= 710 - 414
= 296 km
Speed for remaining journey
= 69 + 5
= 74 km/h
Time taken to travel remaining journey
= 296 ÷ 74
= 4 h
Time taken to travel the whole journey
= 4 + 6
= 10 h
(b)
10 h after 6.35 a.m. = 4.35 p.m.
Answer(s): (a) 10 h; (b) 4.35 p.m.