Question

An object moves with a speed of 20 m/s for 3 seconds and then moves with a speed of 30 m/s for 2 seconds. The average speed of the object is 

20 m/s

24 m/s

15 m/s

10 m/s​

Answer 1

$average \: speed \: = \frac{total \: distance}{total \: time} \\ speed = 20msec \: time \: 3sec \\ speed \: 30m \: sec \: \: time = 2sec \\ distance \: = let \: we \: \: say \: x \\ total \: distance = average \: speed \: \times total \: time \\ distance \: = 50 \times 6 \: msec \\ distance \: = 300m$