Elitmus Exam Numerical Ability Algebra

if v,w,x,y,z are non negative intergers each leass than 7,then how many distinct combinations are possible of(v,w,x,y,z) satisfy v(7^4) +w(7^3)+ x(7^2)+ y(7) +z=151001

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Elitmus Other Question

A man rides at a rate of 18 kmhr but stops 6 min at end of every 7 km .how long will he take to ride 90 km A rectangle is inscribed in circle of area pi/2 with radius r,then what is perimeter of rectangle
1)2r
2)8r
3)2sqrt(2)r
4)4sqrt(2)r