Betty left home at 7.20 a.m. and drove towards the mountain which was 883 km away. For the first 219 km, she was travelling at 73 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 219 km
= 219 ÷ 73
= 3 h
Distance of the remaining journey
= 883 - 219
= 664 km
Speed for remaining journey
= 73 + 10
= 83 km/h
Time taken to travel remaining journey
= 664 ÷ 83
= 8 h
Time taken to travel the whole journey
= 8 + 3
= 11 h
(b)
11 h after 7.20 a.m. = 6.20 p.m.
Answer(s): (a) 11 h; (b) 6.20 p.m.