Question

A person 'X' covered a distance of 'd+40' kilometers at a speed of 40 km/h, another distance of 'd' kilometers at a speed of 15 km/h, and a third distance of 'd−40' kilometers at a speed of 40 km/h. If the average speed of the entire journey is 18 km/h, determine the value of 'd'.

Q: Answer-A person 'X' covered a distance of 'd+40' kilometers at a speed of 40 km/h, another distance of 'd'...

ATQ, Total distance travelled d 40 d d 40 3d km So, 3dd 4040 d15 d 4040 18 Since d is eliminated so, we cannot find the value of d.

A 36

B 25

C 18

D Can't be determined

E None of these

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A person 'X' covered a distance of 'd+40' kilometers at a speed of 40 km/h, another distance of 'd' kilometers at a speed of 15 km/h, and a third distance of 'd−40' kilometers at a speed of 40 km/h. If the average speed of the entire journey is 18 km/h, determine the value of 'd'.

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