Cyclist is travelling with a speed of 16 miles per hour.
there are 1.6 km in 1 mile
1 mile = 1.6 km
As speed is 16 miles per hour it means speed in km is
16 x 1.6 = 25.6 km per hour
And in one day there are 24 hours
if he travels 24 hours then the distance he covered is,
24 x 25.6 = 614.4 km