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হোম›নবম-দশম শ্রেণি›English Version›Mathematics›Simple Simultaneous Equations in Two Variables›C-12-Q116

C-12-Q116mediumsingle_mcq

A boat goes $15$ km/h with the current and $15$ km/h against the current. The speed of the boat in still water is —

a $5$ km/h
b $7.5$ km/h
c $10$ km/h
d $15$ km/h

ব্যাখ্যা

Still-water speed is the average of downstream and upstream speeds: $\dfrac{15+5}{2} = 10$ km/h (the current's $5$ km/h cancels out).

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