botirvoy wrote:
A train traveled from station X to station Y at a constant speed of 88 feet per second. Is the
distance that the train traveled from station X to Station Y greater than 40 miles? (1 mile =
5,280 feet)
(1) It took less than 45 minutes for the train to travel from station X to Station Y.
(2) It took more than 42 minutes for the train to travel from station X to Station Y.
88 ft per sec = 88 X 60 ft per min = 5280 ft per min = 1 mile per min = 60 mph
(1) Time = { 1,2,3,... 44.9} RT = D 60 X( 44.9 / 60) = 44.9 > 40, lets say it took 30 min 60 X( 30 / 60) = 30 < 40 Insuff
(2) Time = { 42.1 ..... } For any value of time in B, apply RT=D and we will get D value greater than 40 Suff
Hence B
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