A train covers the first half of the distance between two stations with a speed of 40 km/h and the other half with 60 km/h. Then its average speed is :

Question

A train covers the first half of the distance between two stations with a speed of 40 km/h and the other half with 60 km/h. Then its average speed is : (A) 50 km/h (B) 48 km/h (C) 52 km/h (D) 100 km/h

Tardigrade Admin · Accepted Answer

v avg =(2 v 1 v 2/ v 1+ v 1) =(2 × 40 × 60/40+60) =48 km / h

Q. A train covers the first half of the distance between two stations with a speed of $40 km / h$ and the other half with $60 km / h$ . Then its average speed is :

50 km/h

48 km/h

52 km/h

100 km/h

$v_{a vg} = \frac{2 v _{1} v _{2}}{v _{1} + v _{1}}$
$= \frac{2 \times 40 \times 60}{40 + 60}$
$= 48 km / h$

Q. A train covers the first half of the distance between two stations with a speed of 40km/h and the other half with 60km/h. Then its average speed is :