Let n. of days of his tour program
So total expenses for the tour= Rs 360n
Now he extends his tour by 4 days,So total tour days = n+4
So daily expenses =360n/(n+4)
AS per question 360n/(n+4)=360-60
360n/(n+4)=300
6n/(n+4)=5
6n=5*(n+4)
6n=5n+20
n=20 days
Hence no of days of tour = 20 days