Question

A man walking at the rate of 6km/hr crosses a bridge in 15 minutes.The length of the bridge is...

Answer 1

Answer:

rate is 6km/h

time is 15min or 15/60hr=1/4

distance = speed*time

=6*15/60

=3/2=1.5

distance traveled by the men=length of the bridge

Answer 2

Concept: Speed is determined by dividing the distance travelled by the time taken to travel it. It gives the amount of time it took to travel a certain distance divided by the distance travelled. Speed is inversely correlated with time and directly correlated with distance.

Given: Speed = 6 km/hr

           Time = 15 min = 15/60 hr = 1/4 hr

To find: The length of the bridge

Solution: As we know the formula, speed = distance / time

Here the length of the bridge is equal to the distance

So, let the distance be x km.

Substituting the given values in the formula, we get

$6 = \frac{x}{\frac{1}{4} }$

$6 = \frac{4x}{1} \\6 = 4x\\x = \frac{6}{4} \\x = \frac{3}{2} = 1.5$

Therefore, the length of the bridge is 1.5 km.

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