How many seconds will a 800 meter long train moving with a speed of 63 km/hr take to cross a man walking with a speed of 3 km/hr in the direction of the train ?  Choose the correct choice
A) 48	B) 52	C) 38	D) 42	E) 45
Explanation:   Here distance d = 800 mts   speed s = 63 - 3= 
<gadget id="calculator">63 - 3</gadget>
<output>60</output>
60 kmph= 60 x 5/18 m/s   time t = 800x 18 / 60x 5= 48 sec.   48NSWER IS 48
<result>A</result>
How many seconds will a 800 meter long train moving with a speed of 63 km/hr take to cross a man walking with a speed of 3 km/hr in the direction of the train ?