Two projectile are thrown at the same time from two different points. The projectile thrown from the origin has initial velocity $3\widehat{\mathrm{i}}+3\widehat{\mathrm{j}}$ with respect to earth. The projectile has initial velocity $\mathrm{a}\widehat{\mathrm{i}}+\mathrm{b}\widehat{\mathrm{j}}$ with respect to earth thrown from the point (10, 5). ($\hat{\mathrm{i}}$ is a unit vector along horizontal, $\hat{\mathrm{j}}$ along vertical). If the projectile collides after two second, then the