Question

How much minutes, is Susan taking more to cover 10 mile in 4th week as compared to cover 10 miles when she runs at same speed as in 3rd week

Answer 1

Seconds taken by Susan in $4th$ week $=87\times 60=5220$.

Seconds taken by Susan in $3rd$ week $=\frac{10}{8}\times 68\times 60=5100$.

Difference between time taken $=5220-5100$

$=120$ seconds

$=2$ minutes.