Question

A boy walking at the rate of 10 km per hour crosses the bridge in 15 minutes. The length of the bridge in meters is

Answer 1

Speed Of boy=10 km/h
Time he take to cross the bridge=15 minutes

$In \: hour = \frac{15}{60}$
=1/4
Now we know
Distance=Speed ×Time
$10 \times \frac{1}{4} \\ \frac{10}{4} \\ \frac{5}{2} \\ 2 \frac{1}{2} \: km$
2 1/2 km =2 km 500 m

$\boxed{\textsf{Distance of bridge=2 km 500. m}}$

Answer 2

the distance covered in 1 hour =10km
10km=10000m
so the distance covered in 15 min=(10000/60) ×15=2500m