11. A train passes a 240-m-long platform in 18 seconds and a man standing on it in 10
seconds. Find the (1) speed and (ii) length of the train.
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Let length of the train be x m .
Speed of train = x / 10 m/s . { speed = distance / time }
Total distance travelled = (x + 240)m
Total time taken = 18 seconds
Speed × time = distance
x/10 × 18 = (x + 240)
9x/5 = x + 240
9x = 5x + 1200
4x = 1200
x = 300m = Length of train .
Speed = 300/10 = 30 m/s
Answer:
speed = 108 km/h ,l= 300m