Gabby left home at 9.35 a.m. and drove towards the mountain which was 763 km away. For the first 252 km, she was travelling at 63 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 252 km
= 252 ÷ 63
= 4 h
Distance of the remaining journey
= 763 - 252
= 511 km
Speed for remaining journey
= 63 + 10
= 73 km/h
Time taken to travel remaining journey
= 511 ÷ 73
= 7 h
Time taken to travel the whole journey
= 7 + 4
= 11 h
(b)
11 h after 9.35 a.m. = 8.35 p.m.
Answer(s): (a) 11 h; (b) 8.35 p.m.