ek train ki speed 40km/hr h usme betha aadmi dusri taraf aati hui train ko dekhta h or usko 6sec m cross hote hue dekhta h or uski lambai 150mtr. h to uski speed btaye.
jitujhirwal:
options 51,52,50,53
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ANS) THE TRAIN WHICH CROSS THE ANOTHER TRAIN SPEED IS 30 KM/HOUR
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