Uday can cover X distance with Y speed in Z time . He can cover same distance with Y + 10 = speed in (Z-2) time . He can cover same distance X with Y `-15` speed in (Z + 6) time . What can be found from the given data .
(i) time to cover 200 km with speed Y + 10
(ii) distance covered in (Z + 6) time (Y + 10) speed
(iii) speed by which a tunnel can be crossed in `(Z)/(2)` hour
(iv) Ratio between time to cover distance X with speed Y to time to cover distance (X-5) with speed (Y + 10)