Question

a car covers 12 km in 50 sec find its speed in kilo meter per hour​

Answer 1

Speed = distance/time

Given- distance = 12km

time = 50 sec = 0.0138hr

$Speed = \dfrac {distance}{Time }$

$speed = \dfrac {12km}{0.0138hr}$

$speed = 869.56 km/ hr$

Answer 2

Explanation:

To convert second to hour

$50sec \: = \frac{50}{60 \times 60 \: } hr$

$= 0.01388 \: hr$

Now to convert km/sec to km/hr

$50 \: km \: persec \: = \frac{50}{0.01388} km \: per \: hr$

$= 864.5533 \: km \: per \: hr$

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