Question

What is the speed of a car that travels 150 km in 3.00 hrs? Is the car speeding on 84th st? (1.0 m/s = 2.23 mi/hr)

Answer 1

Speed = (distance) / (time for the distance)

           =  (150 km) / (2 hours)  =  (150 / 2) (km/hour)  =  75 km/hour .
 
                                                                            (about 46.6 miles/hour)

We don't know the posted speed limit on 84th Street,
so have no basis on which to issue a traffic citation
for a moving violation.

Answer 2

Speed of a car that travels 150 km in 3.00 hrs is 30.97mi/hr

Explanation:

Given:

Distance = 150km

Time = 3hrs

To find:

Speed of the car:

Solution:

$Speed = \frac{distance}{time}$

So by substituting in the equation we get that,

$Speed =\frac{150}{3}$

Speed= 50km/hr

1km/hr = (5/18)m/s

So,

speed = 50*5/18

$speed =\text{50}*\frac{5}{18}$

speed=($\frac{250}{18}$)m/s

1m/s = 2.23mi/hr

So we get that,

Speed = $\text{250}\times\frac{18}{2.23}$

speed = 30.97mi/hr