A car started running at a speed of 30 km/hr and the speed of the car was increased by 2 km/hr at ...
A car started running at a speed of 30 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?
Answer/Solution
390
Steps/Work
The total distance covered by the car in the first 10 hours
= 30 + 32 + 34 + 36 + 38 + 40 + 42 + 44 + 46 + 48
= sum of 10 terms in AP whose first term is 30 and last term is 48 = 10/2 [30 + 48]
= 390 km.
Answer: B
= 30 + 32 + 34 + 36 + 38 + 40 + 42 + 44 + 46 + 48
= sum of 10 terms in AP whose first term is 30 and last term is 48 = 10/2 [30 + 48]
= 390 km.
Answer: B