If the speed of a car is reduced by 20% , then it takes 15 minutes more to complete a distance. Generally how many minutes does it take to cover the distance?
Answers
Answered by
0
Answer:
Time taken is 1 hour or 60 minutes
Step-by-step explanation:
Let the speed of car be x km/hr
and time taken be t hours
Therefore, distance covered = xt km---------I equation
Now, the speed of car is reduced by 20%
So, new speed = x - [20*x/100] = 4x/5 km/hr
Time taken = t hours + 15 minutes
= [t + 1/4] hours
= [4t +1/4] hours
distance covered = [4x/5][4t + 1/4} km----------II equation
Equate both the equations,
xt = [4x/5][4t+1/4]
t = 16t+4/20
20t = 16t + 4
4t = 4
t = 1 hour = 60 minutes
Answered by
0
Answer:
Step-by-step explanation: original speed 100.New speed 80
speed- 5:4.time-4:5.difference=
5-4=1.for 1 15 mint.for 4 4×15
=60mint
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