The ratio between the speeds of two Bullet trains is 7: 8. If the second Bullet train runs 520 kms in 4 hours, then the speed of the first train is:
Select the correct option:
A) 89.25 km/hr. B) 37.25 km/hr. C) 90.25 km/hr. D) 113.75 km/hr. E) 96.25 km/hr.
Let the speed of two bullet trains be 7x and 8x km/hr.   Then, 8x = (520/4)= 
<gadget id="calculator">(520/4)</gadget>
<output>130</output>
130   x= (130/8)= 
<gadget id="calculator">(130/8)</gadget>
<output>65/4 = around 16.25</output>
16.25   Hence, speed of first bullet train= (7 x 16.25) km/hr = 113.75 km/hr.   113.75 km/hr.
<result>D</result>
The ratio between the speeds of two Bullet trains is 7: 8. If the second Bullet train runs 520 kms in 4 hours, then the speed of the first train is: