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A does 80% of a work in 20 days. He then calls in B and they together finish the remaining work in 3 days. How long B alone would take to do the whole work?

Statement

1. All water(100)is divine(50)

2. All temples(100) are divine (50)

Conclusion

1. All water(100)is temple(50)

2. All temples(100)are water(50)

MY APPROACH

Given:total time = 5hr, speed(towards school)=3km/hr,speed(towards home)=2km/hr

first, we find his average speed [2xy/(x+y)] i.e,

average speed= (2*3*2)/(2+3) = 12/5 km/hr

then,

distance=speed x time

distance= (12/5) x 5 = 12km

but this is wrong correct answer is 6km.

HELP!!

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