Question

A man goes from city x to city y and return to city x on his motorbike. The distance between the two cities is 260 km and the man taken 4 hours 20 minutes to complete his journey.
Q. Find his average speed and average velocity in kmph.

Answer 1

Total distance travelled = 260 + 260 = 520km
Total time = 4 hrs 20 min.=
$total \: time \: = \: 4hrs \: 20min \: = \: \frac{13}{3} h$
$avg \: speed \: = \frac{totol \: distnce}{total \: time} = \: \frac{520}{ \frac{13}{3} } = 120kmh {}^{ - 1}$
displacement is zero,

because initial and final point is same.
Hence, average velocity is zero.