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Q.

A bus starts running with an initial speed of 33 km/hr and its speed increases every hour by a certain amount. If it takes 7 hours to cover a distance of 315 km, then what will be the hourly increment (in km/hr) in the speed of the bus?


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a

1

b

2

c

3

d

4 

answer is D.

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Detailed Solution

Sn=n22a+n-1d
315=722×33+7-1d
315×2=766+6d
90-66=6d
6d=24
d=4
 
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A bus starts running with an initial speed of 33 km/hr and its speed increases every hour by a certain amount. If it takes 7 hours to cover a distance of 315 km, then what will be the hourly increment (in km/hr) in the speed of the bus?