Question

A car crosses 22 poles in 10/seconds. If the distance between each pole is 5m,then what is the speed of the car in kmph?

Answer 1

Total distance = 22×5 m=110m
speed=110÷10m/sec=11m/sec
In km/hr = 11×18÷5=39.6km/hr

Answer 2

Given :

A car crosses 22 poles in 10 seconds .

Distance between each poles , d = 5 m .

To Find :

The speed of the car in kmph .

Solution :

Total distance covered :

$d=22\times 5\ m\\d=110\ m=0.11\ km$

Time taken :

$t=10\ sec=\dfrac{10}{60\times 60}\ hours$

We know ,  speed is given by :

$v=\dfrac{d}{t}\\\\v=\dfrac{0.11\ km}{\dfrac{10}{60\times 60}\ hours}\\\\v=39.6\ km/h$

Therefore , the speed of the car is 39.6 km/h .

Learn More :

Speed and distance

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