The ratio between the speeds of two trains is 7 : 8. If the second train runs 400 kms in 4 hours, then the speed of the first train is: Select the correct option.
A) 70 km/hr	B) 75 km/hr	C) 84 km/hr	D) 87.5 km/hr	E) 77.5 km/hr
The ratio between the speeds of two trains is 7 : 8. If the second train runs 400 kms in 4 hours,   then the speed of the first train = 400/4= 
<gadget id="calculator">400/4</gadget>
<output>100</output>
100 kms/hr   then the speed of the first train is:100*7/8= 700/8= 
<gadget id="calculator">700/8</gadget>
<output>175/2 = around 87.5</output>
87.5 km/hr   ANSWER:87.5 km/hr
<result>D</result>
The ratio between the speeds of two trains is 7 : 8. If the second train runs 400 kms in 4 hours, then the speed of the first train is: