Try to solve yourself and share your working. Where are you facing problem?
Hint: Use two equations for two mirrors:
1/v1-1/u1=1/f1
1/v2-1/u2=1/f2
v1=u2, v2/u1 = -3(real image is always inverted; it is also given that it is thrice the size of the object), u1=-10, f2=-30
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