text: yr 10 physics homework, i need help! please...? how do i convert 100m/s to km/h? is there a rule for it? and how do i convert 60km/h to m/s? please help me! is there an easy way to this??? the solution is in the units. before you starting to solve, you should check the units and understand that correctly.  let's solve the question.   100m/s to km/h; if we travel 100m in 1 second then we travel (3600*100)m in a hour.  !!!because 1 hour is equal to 3600 seconds.!!!(eq.1)  360000m is equal 360km.   !!!because 1000m is equal 1km.!!!(eq.2) so your first question's answer is 360km/h  now, using the information above we convert 60km/h to m/s. well, 60 km is equal 60000m. (eq.2) 60000/3600= 16,67m/s (eq.1)  let me ask a question. what is the 717 miles/h in m/s?