1. At a certain speed, a car takes 4 hours to complete the journey of 252 km. Find
Time taken by the car to cover the journey, if the speed of the car is decreased by 9 km/hour. (a) 4 hours 40 minutes (b) 4 hours 10 minute (c) 5 hours 15 minutes (d) 3 hour 40 minutes
Answers
Answered by
1
Answer:
option (a) 4 hour 40 minute
Answered by
0
Answer:
As speed increases, time taken decreases in same proportion. So the time taken and varies inversely to the speed of the vehicle for the same distance.
80
60
=
4
x
60×x=80 and 4÷x=y
60×4=80×x x=
60
80
x=
80
60×4
=3 hr 4÷
60
80
=y
y=
80
4×60
=3 hr
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