While walking 1/3th of his Normal speed ravi arrives 40 minutes late. What is normal time to cover distance.
Numerator * Time / Difference of Numerator and Denominator = Usual Time
This formula is used only when difference between numerator and denominator is more then 1.
Now lets put the value in the formula :
1 * 40/2 = Usual Time
40/2 = Usual Time
20= Usual Time
Usual Time = 20 mintutes
Normal time to cover the distance is 20 mintutes.