4. (15 points) A tanker is being filled with oil at a rate of 3 barrels per minute. Given that 1 barrel equals 159 liters, determine the rate of filling the tanker in m ${ }^{3} /$ hour.
Answer: $28.62 \frac{M^{3}}{\varphi}$

Solution. $3 \frac{\text { barrels }}{\text{min}}=3 \frac{159 \text { liters }}{\frac{1}{60} \varphi}=3 \cdot 159 \cdot 10^{-3} \cdot 60 \frac{\mu^{3}}{\varphi}=28.62 \frac{\mu^{3}}{\varphi}$