Natalie left home at 9.50 a.m. and drove towards the mountain which was 1159 km away. For the first 415 km, she was travelling at 83 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 415 km
= 415 ÷ 83
= 5 h
Distance of the remaining journey
= 1159 - 415
= 744 km
Speed for remaining journey
= 83 + 10
= 93 km/h
Time taken to travel remaining journey
= 744 ÷ 93
= 8 h
Time taken to travel the whole journey
= 8 + 5
= 13 h
(b)
13 h after 9.50 a.m. = 10.50 p.m.
Answer(s): (a) 13 h; (b) 10.50 p.m.