# Tell the average speed of the person during whole journey :

A person goes from P to Q with a speed of 50 km/hr and returned back from Q to P with speed of 30 km/hr. Tell the average speed of the person during whole journey.

- 37.5 km/hr
- 35.5 km/hr
- 41.5 km/hr
- 38.5 km/hr

**Answer: (1) 37.5 km/hr**

**Solution:-** Let the total distance from point P to Q = X Km.

Then time taken from point P to Q =X/50 hrs

and time taken from point Q to P =X/30 hrs

Then, Average speed = Total covered distance/ Total taken time

=(X+X)/(X/50+X/30)

=2 X x 150/8 X

=300/8=37.5 Km/hr

Then, average speed of a person is 37.5 km/hr

So, correct answer is option (1) 37.5 km/hr.