Question

A truck is moving with 18 km/hr in north direction and a car is moving with 36 km/hr in east direction
The speed of car with respect to truck is
(1) 5v5 North-East
(2) 15 m/s North-East
(21 5v5 m/s South-East
H) 10v5 m/s South-East
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Answer 1

the speed of the car is option (a) 5√5..........