Question

A man driving a car in such a way that the car covers n kms in $n^{th}$ second. Find the total distance travelled by the car for 40 seconds (in km)

• A. 40
• B. 820
• C. 800
• D. 810

Answer 1

The correct option is B

820

The distance covered by the car in each second will be in A.P. with common difference 1.

So the sum is = $\frac{40(40+1)}{2}=40\ast \frac{41}{2}=820kms$