The distance \(S\) (in kms) travelled by a particle in time '\(t\)' hours is given by \(S(t) = \frac{t^2 + t}{2}\). Estimate the distance travelled by the particle after
(i) 1 and a half hours.
\(kms\).
(ii) 8 hours and fifteen minutes.
\(kms\).
[Note: Round off your answer to three decimal places.]