Time and Distance Practice Test 1 with solutions

Question : 18 of 40

Marks: +1, -0

The speed of a car increases by 2 km after every one hour. If the distance travelled in first one hour was 35 km. The total distance travelled in 12 hrs. is:

556 km
552 km
482 km
456 km

Validate

Solution:

Distance travelled in 12 hrs = 35 + 37 + 39 + .... upto 12 kms.
This is in A.P. having a = 35, d = 2 & n = 12
Hence, their sum =

{12}/2

[2 × 35 + (12 - 1) × 2] = 6 (70 + 22)
= 6 × 92 = 552 km

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