1.

The speed of a car increase by 1 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?

Answer»

552 km



Total distance travelled in 12 HOURS = (35+37+39+ ……….upto 12 TERMS).
This is an A.P. with FIRST term , a = 35 , number of terms, n = 12, common difference, d = 2.
Required distance = n/2[2a + (n-1)d] = 12/2[2x35 + (12-1)2] = 6[70 + 22] = 552 km.


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