Sriya with her family travelled from Bolpur to Suri by car at a speed of 40 km/hr and returned to Bolpur at a speed of 50 km/hr. The average speed for the whole journey is :
Sriya with her family travelled from Bolpur to Suri by car at a speed of 40 km/hr and returned to Bolpur at a speed of 50 km/hr. The average speed for the whole journey is :
[A]$latex 44\frac{4}{9}&s=1$ km/hr
[B]$latex 44.78&s=1$ km/hr
[C]$latex 45\frac{1}{2}&s=1$ km/hr
[D]$latex 45&s=1$ km/hr
$latex \mathbf{44\frac{4}{9}}\ km/hr&s=1$
Average speed of journey =
$latex = \left ( \frac{2xy}{x+y} \right )\ km/hr&s=1$
$latex = \frac{2\times 40\times 50}{40+50} = \frac{400}{9} = 44\tfrac{4}{9}\ km/hr&s=1$
Hence option [A] is correct answer.