Erika left home at 9.10 a.m. and drove towards the mountain which was 708 km away. For the first 380 km, she was travelling at 76 km/h. Then she increased her speed by 6 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 380 km
= 380 ÷ 76
= 5 h
Distance of the remaining journey
= 708 - 380
= 328 km
Speed for remaining journey
= 76 + 6
= 82 km/h
Time taken to travel remaining journey
= 328 ÷ 82
= 4 h
Time taken to travel the whole journey
= 4 + 5
= 9 h
(b)
9 h after 9.10 a.m. = 6.10 p.m.
Answer(s): (a) 9 h; (b) 6.10 p.m.