A train travels 360 km at a uniform speed. If the speed had been 5 km/h more, it would have taken 1 hour less for the same journey. Find the speed of the train.

A 30 km/hr

B 40 km/hr

C 50 km/hr

D 60 km/hr

Solution

Correct Answer: Option B

মনে করি,
 ট্রেনের গতিবেগ =x কি মি /ঘণ্টা

প্রশ্নমতে ,
(360/x)-360(x+5) =1
বা,{360(x+5)-360x)/x(x+5)=1
বা,360x+1800-360x=x²+5x
বা,1800=x²+5x
বা,x²+5x-1800=0
বা,x²+45x-40x-1800=0
বা,x(x+45)-40(x+45)=0
বা,(x+45)(x-40)=0

   x +45=0
বা,x=-45

অথবা x-40=0
         x=40

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