A car is going east wards with a velocit...

A car is going east wards with a velocity of 8m/s. To the passengers in the car, a train appears to be moving north wards with a velocity of 15 m/s. What is the actual velocity of the train:

7 `ms^(-1)`

17 `ms^(-1)`

23 `ms^(-1)`

none of these

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