Question

a person crosses 900 meter long street in 5minutes.what is his speed in km per hour?

Answer 1

Step-by-step explanation:

speed=distance/time

=900/5

=180m/m

$\: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{ \frac{180}{1000} }{ \frac{5}{60} }$

=10800/5000

=2.16km/h

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Answer 2

Given:

A person crosses 900-meter long street in 5minutes.

To find:

The speed of the man in km/hour.

Solution:

The speed of the man is 30 km/hr.

To answer this question, first of all, we should know that if an object travels or covers distance 'd' in time 't' then its speed is given by:

$= \frac{d}{t}$

Now,

proceeding to the solution, we have

Distance covered by man = 900 meters

The time that was taken by the car to cover 900m distance = 5 minutes

So,

Speed of the man

$= \frac{900}{5}$

$= 180 \: m \: per \: min$

As 1 km = 1000m and 1 hour = 60 min.

So,

180m per min.

$= \frac{180 \times 60}{1000}$

$= 10.8 \: km \: per \: hour$

Hence, the speed of the man is 30 km/hr.