The speed of a car increases by 2 kms after every one hour. If the distance travelled in the first one hour was 35 kms. What was the total distance travelled in 12 hours?
Answers
Answered by
3
Answer:
552 km
Explanation:
Speed in first hour = Distance/time = 35 kmph
Speed in every subsequent hour is 2 more so 37 kmph, 39 kmph ...
Total distance travelled in 12 hrs will be the sum of distances travelled in each of these 12 hrs:
35 + 37 + 39 + 41 + ...
Sum = (n/2)*[2a + (n - 1)*d]
Sum = (12/2)*[2*35 + (12 - 1)*2]
Sum = 6 * [70 + 22] = 552 km
Answer (C)
Similar questions