Wipro Company Numerical Ability Time Distance and Speed

Runner A is twice as fast as Runner B. If runner B takes 10 minutes to run 5 km, how long will it take runner A to run 15 km (in minutes)?
a)3.333
b)10
c)15
d)30

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Wipro Other Question
The average of 10 numbers is 7.4, while the average of the other 8 numbers in my set is 6.5. What’s the average of the entire set, rounded to one decimal?
a)6.8
b)6.9
c)7.0
d)7.1
e)7.2 The ratio of snakes to pineapples if 1:4. If there are 6 more snakes and 2 less pineapples, the ratio would be 3:10. How many pineapples are there?
a)33
b)64
c)76
d)132