Penelope left home at 7.40 a.m. and drove towards the mountain which was 1002 km away. For the first 486 km, she was travelling at 81 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 486 km
= 486 ÷ 81
= 6 h
Distance of the remaining journey
= 1002 - 486
= 516 km
Speed for remaining journey
= 81 + 5
= 86 km/h
Time taken to travel remaining journey
= 516 ÷ 86
= 6 h
Time taken to travel the whole journey
= 6 + 6
= 12 h
(b)
12 h after 7.40 a.m. = 7.40 p.m.
Answer(s): (a) 12 h; (b) 7.40 p.m.