GMAT Problem Solving (PS) | When Jack picks olives for two hours at three times his regu

When Jack picks olives for two hours at three times his regular speed, he picks 10 pounds of olives more than Mac working for five hours at 80% of his regular speed. Therefore, if Mac picks olives for one hour at double his regular speeds, and Jack picks olives for four hours at 75% of his regular speed, then


A. Jack picks double the amount of olives Mac picks
B. Mac picks 10 pounds more than Jack
C. Jack picks 10 pounds more than Mac
D. Mac picks 5 more pounds than Jack
E. Jack picks 5 more