Question 224675
d=rt or 
d=75(x-1/6)
d=55x
The 2 distances are equal thus:
75(x-1/6)=55x
75x-75/6=55x
75x-55x=75/6
20x=75/6
20x=12.5
x=12.5/20
x=5/8 or .625 or 37.5 minutes after your friend leave you will catch up with him.
Proof:
75(5/8-1/6)=55*5/8
75(5*6-8)/48=275/8
75(30-8)/48=275/8
75*22/48=275/8
1,650/48=275/8
48*275=8*1,650
13,200=13,200