Answer:
c. 135 hr
Step-by-step explanation:
The following method of converting units is called "dimensional analysis."
Write every conversion factor as a fraction. Each conversion factor fraction equals 1, so it changes units but not the value. In the end, all the undesired units cancel out leaving the desired units. Multiply the given amount by the necessary conversion factors until you arrive at the desired units.
[tex]3~extra~bagal \times \dfrac{10~sobrang~bagal}{1~extra~bagal} \times \dfrac{3~bagal}{1~sobrang~bagal} \times \dfrac{90~min}{1~bagal} \times \dfrac{1~hr}{60~min} =[/tex]
[tex] = 135~hr} [/tex]
