What is the Horse-Power Developed by an Engine in 30 Seconds?

[NumberTheory]

Homework Statement

A motor car of mass 2 tons moves from rest with constant acceleration and acquires a velocity of 30 miles/hr in 30 seconds . Show that the horse-power developed by the engine during that time is 16.43 .

Homework Equations

Power = Work-done/Time taken

The Attempt at a Solution

I just can't get the answer to match . I keep getting values much larger than 16.43 !

 

[SteamKing]

Show us your calculations, and we can help you.