$A$ train is running at a constant speed of $90 \,km/h$ on a straight track. $A$ person standing on the top of a bogie moves in the direction of motion of the train such that he covers $1 \,m$ on the train each second. The speed of the person with respect to the ground is .........
- A$25 \,m/s$
- B$91 \,km/h$
- C$26 \,km/h$
- D$26 \,m/s$
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