Question

A train travels 700 metres in 35 seconds. What is its speed in $\frac{km}{h}$?

Answer 1

Distance = 700 m

Time taken = 35 seconds

Speed in $\frac{m}{sec}$ $=\frac{700}{35}$

$=20\frac{m}{s}$

Speed in $\frac{km}{hr}=\frac{20\times 60\times 60}{1000}$ ...{$\because 1km=1000mand1hour=60\times 60seconds$}

$=72$ km/hr