The ratio between the speeds of two persons is 7:8.If the second main runs 400 km in 4 hours,then find the speed of the another person? Select the correct option.
A) 91.6km/hr  B) 87.5km/hr  C) 80.5 km/hr  D) 92 km/hr  E) 120.1 km/hr
Let the speed of two persons be 7x and 8x km/hr   8x=400/4= 
<gadget id="calculator">400/4</gadget>
<output>100</output>
100/8= 
<gadget id="calculator">100/8</gadget>
<output>25/2 = around 12.5</output>
12.5   Speed of first person=(7*12.5)km/hr   =87.5 km/hr   Answer is option 87.5km/hr
<result>B</result>
The ratio between the speeds of two persons is 7:8.If the second main runs 400 km in 4 hours,then find the speed of the another person?