Question

The speed of three cars in the ratio 3 : 4 : 5. The ratio between time taken by them to travel the same distance is

Answer 1

let the distance between the ratio of three cars speed be X
so 3x, 4x,5x= distance/time taken
3x = d/t1
t1=d/3x

4x=d/t2
t2/4x

5x=d/t3
t3/5x

so the ratios of 3 cars speed is
t1:t2:t3
=3:4:5
your answer

i hope its help you!

Answer 2

let there speed be X
and distance covered be d
then there speed will be 3x,4x,5x
3x=d/t1
t1=d/3x••••••(1)

4x=d/t2
t2=d/4x••••••••(2)
5x=d/t3
t3=d/5x •••••••••(3)
t1:t2:t3=5:4:3