One third of a certain journey is covered at the rate of 25 km/hr, one forth at the rate of 30 km/hr and the rest at 50 km/hr. The average speed for the whole journey is :

One third of a certain journey is covered at the rate of 25 km/hr, one

1.	One third of a certain journey is covered at the rate of 25 km/hr, one forth at the rate of 30 km/hr and the rest at 50 km/hr. The average speed for the whole journey is :
A.	5 km/hr
B.	$33\frac{1}{3}$$ km/hr
C.	0 km/hr
D.	$37\frac{1}{12}$$ km/hr
Answer» C. 0 km/hr

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One third of a certain journey is covered at the rate of 25 km/hr, one forth at the rate of 30 km/hr and the rest at 50 km/hr. The average speed for the whole journey is :

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