Gwen left home at 10.45 a.m. and drove towards the mountain which was 908 km away. For the first 276 km, she was travelling at 69 km/h. Then she increased her speed by 10 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 276 km
= 276 ÷ 69
= 4 h
Distance of the remaining journey
= 908 - 276
= 632 km
Speed for remaining journey
= 69 + 10
= 79 km/h
Time taken to travel remaining journey
= 632 ÷ 79
= 8 h
Time taken to travel the whole journey
= 8 + 4
= 12 h
(b)
12 h after 10.45 a.m. = 10.45 p.m.
Answer(s): (a) 12 h; (b) 10.45 p.m.