Sujal covers a distance in 40 min , if she drives at a speed of 60 km/h on an average. Find the speed at which she must drive at to reduce the time of the journey by 25%.
A. 60 km/h
B. 70 km/h
C. 75 km/h
D. 80 km/h
Solution(By Examveda Team)
Given Speed = 60 Kmph.
It means Sujal covered 60 km in 60 min (1 hour). So, in 40 min he will cover 40 km.
25% time reduced = 40 - 25% of 40 = 30 min.
Thus, Sujal needs to cover 40 km in 30 min (0.5 hour).
Speed * Time = Distance.
Speed * 0.5 = 40
Speed = 80 kmph.
Join The Discussion
Comments ( 10 )
Which of the following is not a primary function of a Bank?
A. Granting Loans
B. Collecting Cheques/Drafts customers
C. Facilitating import of goods
D. Issuing Bank Drafts
A. Regulatory jurisdictional fight between SEBI and IRDA
B. They don’t offer better tax benefits
C. They offer lesser returns compared to traditional insurance policies
D. All of the above
The Chameli Devi Jain Award is given for an outstanding woman ____?
A. Scientist
B. Reporter
C. Player
D. Teacher
D
c
c
Answer is D because person cover distance in 40 min at speed of 60 km/h so total distance covered by him is 60 * 40/60 (in hour)= 40 kilometer now he has to reduce time 25% so he has to reach in 40/60-20%=1/2 speed=1/2*40(40 is distance) = 80km/ph
D. 60×40= final speed × (25% less time = 30)
Solving this
Final speed = 80
d
80 km per hour ?
Explanation. @Sravs?
80 because as speed=60km/hr so in 40 min she travels 40 km after reducing time by 25% the new time will be 30 min min now speed=d/t,s=40*60/30=80(30 min change into hour by dividing 60)
80 km/h