Question

if many runs at a speed of 25 km per hour how long will it take to run a 800 metre race

Answer 1

Given
speed of man = 25km/h or 25×1000/60
= 2500/6 m /min

given distance = 800m

now as distance = speed × time

or time = distance/speed

= (800)/(2500/6)

= 800× 6/2500

= 4800/2500

= 48/25 min

= 1.92 min

or = 1 min 55.2 sec