a car started running at a speed of 34 km / hr and the speed of the car was increased by 2 km / hr at the end of every hour . find the total distance covered by the car in the first 10 hours of the journey .
"a 43 km the total distance covered by the car in the first 10 hours = 34 + 36 + 38 + 40 + 42 + 44 + 46 + 48 + 50 + 52 = sum of 10 terms in ap whose first term is 34 and last term is 52 = 10 / 2 [ 34 + 52 ] = 430 km ."
divide(add(add(34, multiply(2, 10)), 34), 2)