Usha left home at 8.45 a.m. and drove towards the airport which was 752 km away. For the first 240 km, she was travelling at 60 km/h. Then she increased her speed by 4 km/h and completed the remaining journey.
- How long did she take for her whole journey?
- At what time did she reach the airport?
(a)
Time taken to travel 240 km
= 240 ÷ 60
= 4 h
Distance of the remaining journey
= 752 - 240
= 512 km
Speed for remaining journey
= 60 + 4
= 64 km/h
Time taken to travel remaining journey
= 512 ÷ 64
= 8 h
Time taken to travel the whole journey
= 8 + 4
= 12 h
(b)
12 h after 8.45 a.m. = 8.45 p.m.
Answer(s): (a) 12 h; (b) 8.45 p.m.