Using the Pythagorean theorem, we have: (a^2 + b^2 = c^2) where (a) and (b) are the lengths of the shorter sides and (c) is the length of the hypotenuse. Substituting the given values, we get: (3^2 + 4^2 = c^2) (9 + 16 = c^2) (25 = c^2) (c = \sqrt{25}) (c = 5) Therefore, the length of the hypotenuse is 5 units.

To find the time at which the second train will overtake the first train, we need to find the time it takes for the second train to travel the distance between the two trains. The distance between the two trains is equal to the speed of the first train multiplied by the time difference between the two trains. The time difference between the two trains is 1 hour. Therefore, the distance between the two trains is: (60 \text{ mph} \times 1 \text{ hr} = 60 \text{ miles}) The speed of the second train is 75 mph. Therefore, the time it takes for the second train to travel 60 miles is: (60 \text{ miles} \div 75 \text{ mph} = 0.8 \text{ hr}) Converting 0.8 hours to minutes, we get: (0.8 \text{ hr} \times 60 \text{ min/hr} = 48 \text{ min}) Therefore, the second train will overtake the first train at 12:30 PM.

The number of male employees is (100 \times 60/100 = 60). Therefore, the number of female employees is (100 - 60 = 40).

The discount is (20 \times \$20/100 = \$4). Therefore, the sale price of the shirt is ($20 - \$4 = \$16).

The farmer plants corn on (100 \times 60/100 = 60) acres of land and soybeans on (100 \times 20/100 = 20) acres of land. Therefore, the farmer plants wheat on (100 - 60 - 20 = 20) acres of land.