Since Stacey already covered a distance which is (6 mile/hr * 24 min) = 2.4 mile
The remaining distance is (20 - 2.4) = 17.6 mile which will be covered in 17.6 / 11(6+5) = 1.6 hr
And, in that 1.6 hr H will cover 1.6 * 5 = 8 miles.
The remaining distance is (20 - 2.4) = 17.6 mile which will be covered in 17.6 / 11(6+5) = 1.6 hr
And, in that 1.6 hr H will cover 1.6 * 5 = 8 miles.
