Question

if time taken to travel between two stations is reduced by20%. By what percent would the speed of train be increased?​

Answer 1

Answer:

80%

Step-by-step explanation:

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Answer 2

Answer:

Let distance,speed,time be s,v and t

then

s = vt ------ (i)

since t has decreased by 20%

=> t - 20/100t = 4t/5

since the distance is same and new speed be x

so s = x ×4t/5-------(ii)

from i and ii

vt = x× 4t/5

=> x = 5vt/4t

=> x = 5v/4

Hence the new speed is 5v/4

5/4× 100

= 75%

Hencethe speed is increased by 75%