Wendy left home at 10.15 a.m. and drove towards the mountain which was 711 km away. For the first 183 km, she was travelling at 61 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 183 km
= 183 ÷ 61
= 3 h
Distance of the remaining journey
= 711 - 183
= 528 km
Speed for remaining journey
= 61 + 5
= 66 km/h
Time taken to travel remaining journey
= 528 ÷ 66
= 8 h
Time taken to travel the whole journey
= 8 + 3
= 11 h
(b)
11 h after 10.15 a.m. = 9.15 p.m.
Answer(s): (a) 11 h; (b) 9.15 p.m.