A man travels from Delhi to Chandigarh.  If he travels 25% faster than his speed, he would reach at Chandigarh 15 minutes early.  By how many minutes would he be late if he traveks 40% slower than usual speed?

50 mins.

Let usual speed = 100

       25% faster = 125

Speed    →  100    :   125

                    4     :     5

Time      →    5     :     4 ..... (Diff. 1)

Difference = 1R = 15 min

actual time = 5R = 5× 15 = 75 min

⇒ Reduced speed by 40%

Usual speed = 100

New speed = 60

Speed    →  100    :    60

                    5     :     3

Time      →    3     :     5 

Usual time = 75 min

3R  →  75

1R →  25

5R →  125

Late by 125 - 75 = 50 mins