Trains Boats and Streams Practice Test 5 with solutions

Length of the train = 100 meters = $\frac{1}{10}$ km
Speed of the man = 5 km/hr
Time = $7\frac{1}{5}$ = $\left(\frac{36}{5\times 60\times 60}\right)$ hrs
= $\frac{1}{500}$ hrs
Let the speed of the train = x kmph
So, $\frac{1}{500}$ = $\left(\frac{\frac{1}{10}}{\mathit{x}+5}\right)$
$\frac{\mathit{x}+5}{500}$ = $\frac{1}{10}$
10x + 50 = 500
10x = 450
x = 45 kmph