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Answer:
Let the object be at a distance u from the concave mirror
Now
Given
f=40 cm
we know
m=v/u
3=v/u
v=3u
now
1/f=1/v-1/u
1/40=1/3u-1/u
1/40=(1-3)/u
1/40= -2/u
u/-2=40
u=40×-2
u=-80 cm
v= 3u = 3 × -80 = -240 cm