Yoko left home at 8.10 a.m. and drove towards the mountain which was 628 km away. For the first 304 km, she was travelling at 76 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 304 km
= 304 ÷ 76
= 4 h
Distance of the remaining journey
= 628 - 304
= 324 km
Speed for remaining journey
= 76 + 5
= 81 km/h
Time taken to travel remaining journey
= 324 ÷ 81
= 4 h
Time taken to travel the whole journey
= 4 + 4
= 8 h
(b)
8 h after 8.10 a.m. = 4.10 p.m.
Answer(s): (a) 8 h; (b) 4.10 p.m.