Marion left home at 5.30 a.m. and drove towards the mountain which was 915 km away. For the first 445 km, she was travelling at 89 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 445 km
= 445 ÷ 89
= 5 h
Distance of the remaining journey
= 915 - 445
= 470 km
Speed for remaining journey
= 89 + 5
= 94 km/h
Time taken to travel remaining journey
= 470 ÷ 94
= 5 h
Time taken to travel the whole journey
= 5 + 5
= 10 h
(b)
10 h after 5.30 a.m. = 3.30 p.m.
Answer(s): (a) 10 h; (b) 3.30 p.m.