Xuan left home at 6.30 a.m. and drove towards the mountain which was 927 km away. For the first 335 km, she was travelling at 67 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 mountain?
(a)
Time taken to travel 335 km
= 335 ÷ 67
= 5 h
Distance of the remaining journey
= 927 - 335
= 592 km
Speed for remaining journey
= 67 + 7
= 74 km/h
Time taken to travel remaining journey
= 592 ÷ 74
= 8 h
Time taken to travel the whole journey
= 8 + 5
= 13 h
(b)
13 h after 6.30 a.m. = 7.30 p.m.
Answer(s): (a) 13 h; (b) 7.30 p.m.