The speed of a car increases by 2 km after every hour. If the distance travelled in the first hour was 35 km, what was the total distance travelled in 12 hours?
Pick:  A) 522 km  B) 456 km  C) 556 km  D) 482 km  E) None of these
This is the problem of arithmetic progression (AP) with the first term (a) = 35, common difference (d) = 2 and total no. of terms (n) = 12. The sum of this series will be total distance travelled.   Sum (Sn) = n⁄2{2a + (n - 1)d} = 12⁄2{70 + 11 × 2}   = 12×92/2=552km   Answer None of these
<result>E</result>
The speed of a car increases by 2 km after every hour. If the distance travelled in the first hour was 35 km, what was the total distance travelled in 12 hours?