The ratio between the speeds of two trains is 3: 4. If the second train runs 400 kms in 6 hours, then the speed of the first train is ?
Select:	A) 50.01 km/hr	B) 51.01 km/hr	C) 40.01 km/hr	D) 52.01 km/hr	E) None of these
Explanation:   Let the speeds of two trains be 3X and 4X km/hr.   4/X=400/6=&gt;X=16.67 Km/hr   So speed of first train is   16.67*3= 
<gadget id="calculator">  16.67*3</gadget>
<output>50.01</output>
50.01 km/hr   Option 50.01 km/hr
<result>A</result>
The ratio between the speeds of two trains is 3: 4. If the second train runs 400 kms in 6 hours, then the speed of the first train is ?