Sainik School Entrance Exam 2018 Solved Paper

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Question : 48 of 150

Marks: +1, -0

A motor car starts with a speed of 70 km/hr with its speed increasing every 2 hrs by 10 km/hr. In how many hours will it cover 345 kms.

$2 1/2 \hrs.$
$4\hrs. 5 \min$
$4 1/4 \hrs.$
$3 \hrs.$

Solution:

(c)

\Distance \Time

70 ×2=140 \km 2 \hrs.

80 ×2=160 \km 2 \hrs.

90×1/2=45

....

1/2\hrs.

Total distance

= 345 \km, \time = 4{1/2} \hrs.

So, total distance

345 \km

covered in

4{1/2}\hrs.

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