A person covers certain distance in 7 hours at a speed of 4 km/h and some more distance in 2 hours at a speed of 2 km/h. Find his average speed for the entire distance covered.

Correct option is A

Given:

Speed for distance covered in 7 hours = 4 km/hr

Speed for distance covered in 2 hours = 2 km/hr

Formula Used:

Distance = Speed $$\times$$​ Time

Average Speed =$$\frac{Total \ Distance}{Total \ Time}$$​​

Solution:

Distance covered at 4km/hr = 7 $$\times$$ 4 = 28 km

Distance covered at 2km/hr = 2 $$\times$$ 2 = 4 km

Total distance = 28 + 4 = 32 km

Total time = 9 hours

Average Speed = $$\frac{32}{9} = 3\frac{5}{9}km/hr$$​​