Recently i have seen this question and i am unable to find a logic for this.

Here the bike goes with certain speed and after every **X** minutes the speed decreases. So he increases the speed after every **Y** minutes. To set the bike in normal condition he have to give **K** minutes of high speed or **2K** minutes of low speed assuming that bike is getting high speed and low speed evenly.

Input:

X =4 Y=2 K=7

Output:

7

Here we need to find the total time to get the bike into normal state