1.  If a person walks at 14 km/hr instead of 10 km/hr, he would have walked 20 km more. The actual distance travelled by him is :
A. 50 km
B. 56 km
C. 70 km
D. 80 km

Answer: Option A

Explanation:

Let the actual distance travelled be x km.

Then, x /10 = ( x + 20)/(14)

<=> 14x = 10x + 200

<=> 4x = 200

<=> x = 50 km