Answer:
9mph
Step-by-step explanation:
Given the following :
Speed of train = 45miles per hour
Distance of the man = 2/5
To avoid just about being hit by the train:
The main may run to the start point of the bridge towards the train = 2/5 length of the bridge, this is also when the train gets to the bridge
If the man runs forward away from the train, he has to cover a distance of (1 - 2/5) = 3/5 to avoid being hit, this is also when the train gets to the end of the bridge.
From here it could be inferred that :
The distance 3/5 ran by the man away from the bridge is equivalent to (3/5 - 2/5) =1/5, which seems to be moved by th etrain during the same period.
However, the only explanation for the discrepancy in length or distance is that the train moves faster than the man.
If the train's speed = 45mph
Then the train's speed is 5 times the speed of the man;
Man speed is thus;
(1/5) * 45 = 9mph
