CTS Company Logical Reasoning Letter Arrangement

In 400m race A gives B a start of 7 sec and beats him by 24 sec. In another race A beats B by 10 sec.the speeds are in the ratio

a)8:7
b)7:6
c)10:8
d)6:8
e)12:10

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CTS Other Question
Two distinct no s are taken from 1,2,3,4......28 Find the probability that their sum is less than 13 At a certain moment a watch shows 2 min lag although it is running fast. If it showed a 3 min lag at that moment, but also gains by 1/2 min more a day than its current speed it would show the true time one day sooner than it usually does. How many mins does the watch gain per day.
a).2
b).5
c).6
d).4
e).75