FORMULAE FOR TRAIN QUESTIONS IN TIME AND DISTANCE
1. TIME TAKEN TO CROSS A POLE OR A MAN = LENGTH OF A TRAIN / SPEED OF A TRAIN 2. TIME TAKEN TO CROSS A PLATFORM = LENGTH OF ( TRAIN + PLATFORM ) / SPEED OF TRAIN 3. TIME TAKEN TO CROSS A BRIDGE = LENGTH OF (TRAIN + BRIDGE) / SPEED OF TRAIN 4. WHEN 2 TRAINS MOVE TOWARDS EACH OTHER THEN, TIME TAKEN TO CROSS EACH OTHER = SUM OF LENGHTHS OF BOTH TRAINS / SUM OF THEIR SPEEDS 5. WHEN 2 TRAINS ARE MOVING IN THE SAME DIRECTION THEN, TIME TAKEN TO CROSS EACH OTHER = SUM OF LENGTHS OF BOTH TRAINS / DIFFERENCE OF THEIR SPEEDS 6. WHEN 2 TRAINS ARE MOVING AT SPEED OF x km/hr AND y km/hr (i) RELATIVE SPEED WHEN MOVING TOWARDS EACH OTHER=(x+y) km/hr (ii) RELATIVE SPEED WHEN MOVING IN THE SAME DIRECTION=(x-y) km/hr WHERE x>y