C-12-Q119mediumsingle_mcq

Two trains of total length $300$ m cross each other in $5$ s in opposite direction and in $15$ s in same direction. Sum of speeds = $60$ m/s and difference = $20$ m/s. The faster train's speed is —

a $20$ m/s
b $30$ m/s
c $40$ m/s
d $50$ m/s

ব্যাখ্যা

When two objects cross, the faster speed is half the sum of the sum and difference of speeds: $\dfrac{60 + 20}{2} = 40$ m/s. So the faster train moves at $40$ m/s.

এই অধ্যায়ের আরও প্রশ্ন

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Simple Simultaneous Equations in Two Variables — সব প্রশ্ন দেখুন (152টি) →

Two trains of total length 300300300 m cross each other in 555 s in opposite direction and in 151515 s in same direction. Sum of speeds = 606060 m/s and difference = 202020 m/s. The faster train's speed is —

ব্যাখ্যা

এই অধ্যায়ের আরও প্রশ্ন

Two trains of total length 300300300 m cross each other in 555 s in opposite direction and in 151515 s in same direction. Sum of speeds = 606060 m/s and difference = 202020 m/s. The faster train's speed is —

ব্যাখ্যা

এই অধ্যায়ের আরও প্রশ্ন

Two trains of total length $300$ m cross each other in $5$ s in opposite direction and in $15$ s in same direction. Sum of speeds = $60$ m/s and difference = $20$ m/s. The faster train's speed is —

Two trains of total length $300$ m cross each other in $5$ s in opposite direction and in $15$ s in same direction. Sum of speeds = $60$ m/s and difference = $20$ m/s. The faster train's speed is —