Question: If t1=Time at which water is first added to cement, t2=Time when needle fails to penetrate 5 mm to 7 mm from bottom of the mould, t3=Time when the needle makes an impression but the attachment fails to do so, then what is initial setting time?
Options
A : t2-t1
B : t2+t1
C : t3-t1
D : 2*t1
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