posted by hemant mishra .
Jack and Jill run 10 kilometers. They start at the same point,
run 5 kilometers up a hill, and return to the starting point by the same route. Jack has
a 10-minute head start and runs at a rate of 15 km/hr uphill and 20 km/hr downhill.
Jill runs 16 km/hr uphill and 22 km/hr downhill. How far from the top of the hill are
they when they pass going in opposite directions?