An engine pulls four indentical carriages .The engine is 2/3 the length of carriage and the total length of the train is 86.8m .Find the length of the engine.

A 12.4m

B 12m

C 11.5 m

D 13m

Solution

Correct Answer: Option A

মনে করি ,বহনকারী ইঞ্জিনের দৈর্ঘ্য =x m
প্রশ্নমতে ,4x + 2x /3 =86.8
          বা, 12 x +2x=86.8×3
          বা, 14x =86.8×3
          বা, x=(86.8×3)/4
          বা, x=18.6
অতএব ,ইঞ্জিনের দৈর্ঘ্য =18.6 × 2/3 =12.4 m

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