Question

A racing car covered 600 km in 3 hours 20 minutes. Find its speed in meter per second.
How much distance will the car cover in 50 sec?

Answer 1

Given: A racing car covers 600 km in 3 hours and 20 minutes.

We need to calculate the speed in meters per second.

Distance $=600km$

$=600\times 1000m$

$=600000m$

Time $=3$ hours 20 minutes

$=3$ hours + 20 minutes

$=3\times 60minutes+20minutes$
$[1hour=60min]$
$=180min+20min$

$=200mins$

$=200\times 60sec$ $[1min=60sec]$

$=12000sec$

$\because Speed=\frac{distance}{Time}$

$=\frac{600000m}{12000sec}$

$=50m/s$

$Time=50sec$

$Speed=50m/sec$

$Speed=\frac{Distance}{Time}$

$50m/s=\frac{distance}{50}$

$Distance=50\times 50$

$=2500m$

Hence, the distance covered by a car in 50 second is 2500 m or 2.5 km.