A & B are completely soluble in both liquid and solid states; melting point of A and B are 1800 degree C and 1450 degree C respectively. An alloy containing 40 % B starts to solidify at 1710 degree C by separating crystals of 15 % B. an alloy containing 70 % B starts to solidify at 1550 degree C by separating crystals of 37 % B. 

Construct the phase diagram. 

For an alloy containing 70 % B: 

A- Give the temperature of initial and final solidification. 

B- Give the chemical composition and the amounts of the phases present at 1500 degree C

C- Draw the cooling curve