(b) $\frac{V_{1}}{T_{1}} = \frac{V_{2}}{T_{2}}$ $\frac{20}{10} = \frac{V_{2}}{30}\ \ \Rightarrow V_{2} = 60\ L$ $V_{2}\ –V_{1} = 60 - 20 = 40\ L$
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.