Two train 250 m and 350 m long are going in the same direction at 30 km and 36 km per hour respectively. The longer train is behind the shorter train. How long would it take to pass each other ?

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Solution

Relative speed of the train $= (36 - 30)$ km/hr
$= 6$ km/hr
$= \frac{6 \times 1000}{3600}$ m/sec
$= \frac{5}{3}$ m/sec
Time taken to pass each other = time taken to cover $(250 + 350)$ m ie $600$ m at $\frac{5}{3}$ m/sec
$= \frac{600}{\frac{5}{3}}$ sec
$= 360$ sec
$= 6$ min

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Two train 250 m and 350 m long are going in the same direction at 30 km and 36 km per hour respectively. The longer train is behind the shorter train. How long would it take to pass each other ?

Relative speed of the train =(36−30) km/hr =6km/hr =6×10003600m/sec =53m/secTime taken to pass each other = time taken to cover (250+350)m ie 600m at 53m/sec =60053 sec =360 sec =6 min

Relative speed of the train $= (36 - 30)$ km/hr
$= 6$ km/hr
$= \frac{6 \times 1000}{3600}$ m/sec
$= \frac{5}{3}$ m/sec
Time taken to pass each other = time taken to cover $(250 + 350)$ m ie $600$ m at $\frac{5}{3}$ m/sec
$= \frac{600}{\frac{5}{3}}$ sec
$= 360$ sec
$= 6$ min