Question

if a boy takes 12 minutes to cover a distance of 10 km then if his speed is reduced by 5 km h then how much time will it take to cover the same distance

Answer 1

here Given,
time=12min=1/5hr
distance=10km
then,speed=distance/time=10/1/5=10×5/1
=50Km/hr if, speed is reduced by 5km/hr
then, speed=45 km /he
we know that,time=distance/speed
=) time=10/45 hr
=)0.2222-----nd so on
=)0.21 hr
=)13min (approximately)