On each market day Mrs. Bassey walks to the market from her home at a steady speed. This journey normally takes her 2 hours to complete. She finds, however, that by increasing her usual speed by 1 km/hr she can save 20 minutes. Find her usual speed in km/hr
-
A.
1(frac{2}{3}) -
B.
2 -
C.
5 -
D.
6 -
E.
10
Correct Answer: Option C
Explanation
Let x rept. the usual speed = (frac{Distance}{Time})
= (frac{20}{1}) x (frac{1}{2})
= 5