If
(A) 300
(B) 600
(C) 750
(D) 450
A motorboat covers a certain distance downstream in a river in 3 hours. It covers the same distance upstream in 3 and half an hour. If the speed of the water is 1.5 km / h, then the speed of the boat in still water is:
(A) 19.5 km/h
(B) 19 km/h
(C) 17 km/h
(D) 17.5 km/h
A boat moves downstream at the rate of 1 km in
(A) 4 km/hour
(B) 3 km/hour
(C) 8 km/hour
(D)
The LCM of two positive integers is twice the larger number. The difference of the smaller number and the GCD of the two numbers is 4. The smaller number is:
(A) 8
(B) 10
(C) 12
(D) 6
What is the LCM (least common multiple) of 57 and 93?
(A) 1576
(B) 1767
(C) 1567
(D) 1919
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