Problem 1-6| General Principles| Engineering Mechanics: Statics| RC Hibbeler

If a car is traveling at 55 mi/h, determine its speed in kilometers per hour and meters per second.

Solution:

First, convert 55 mi/h to km/h. 

55\:\frac{mi}{h}=\left(\frac{55\:mi}{1\:h}\right)\left(\frac{5280\:ft}{1\:mi}\right)\left(\frac{0.3048\:m}{1\:ft}\right)\left(\frac{1\:km}{1000\:m}\right)=88.5\:\frac{km}{h}

Next. we convert 88.5 km/h to m/s.

88.5\:\frac{km}{h}=\left(\frac{88.5\:km}{1\:h}\right)\left(\frac{1000\:m}{1\:km}\right)\left(\frac{1\:h}{3600\:s}\right)=24.6\:\frac{m}{s}