Question

A man walks at a certain distance ai 84 min.He covers two - thirds of the journey in 4 km/hr and the rest at 5 km/hr .Calculate the total distance covered.

Answer 1

 let t be the time 
and x be the total distance
x=4*t+5*(84/60-t) 
x=7-t
2x/3 = 4t
x/3 = 5*(84/60-t)

 t=60
x= 6km