The ratio between speed of the two trains is 7:8. If the 2nd train runs 400 km in 4 hrs, what is the speed of the 1st train?  Choose the correct choice
A) 87.9  B) 87.5  C) 87.7  D) 87.6  E) 43.3
Answer: b   Explanation:   Speed of 2nd train = 400/4= 
<gadget id="calculator">400/4</gadget>
<output>100</output>
100 kmph   Since the ratios are in 7 : 8   Speed of First train= 7/8 × 100 = 87.5 kmph   Answer:87.5
<result>B</result>
The ratio between speed of the two trains is 7:8. If the 2nd train runs 400 km in 4 hrs, what is the speed of the 1st train?