Question

The speed limit on some interstate highways is roughly 115 km/h. What is the meters per second? how many miles per hours is this?

Answer 1

Speed in meter per second = 31.94 m/s

Speed in miles per hour = 71.46 miles/h

Step-by-step explanation:

Speed is measure of distance traveled per unit time. It is :

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

Given the speed = 115 km/ h

Considering, 1 km = 1000 m

Also, 1 h = 3600 s

So,

`Speed=\frac {115* 1000\ m}{3600\ s}=31.94\ m/s`

Thus speed in meter per second = 31.94 m/s

Considering, 1 km = 0.621371 miles

So,

`Speed=\frac {115* 0.621371\ miles}{h}=71.46\ miles/h`

Thus, speed in miles per hour = 71.46 miles/h