The ratio between the speeds of two trains is 7: 9. If the second train runs 540 kms in 3 hours, then the speed of the first train is ? Choose one.
A) 140 km/hr	B) 130 km/hr	C) 110 km/hr	D) 120 km/hr	E) None of these
Explanation:   Let the speeds of two trains be 7X and 9X km/hr.   9/X=540/3=&gt;X=20Km/hr   So speed of first train is   20*7= 
<gadget id="calculator">  20*7</gadget>
<output>140</output>
140 km/hr   Option 140 km/hr
<result>A</result>
The ratio between the speeds of two trains is 7: 9. If the second train runs 540 kms in 3 hours, then the speed of the first train is ?