By reducing the circumference of a circle by 50 percent, by what percentage will its area decrease?
(A) 12.5 %
(B) 25 %
(C) 75 %
(D) 50 %
A man sets out on a journey. He travelled for a total of 16 hours. He covered the first half of the distance at a speed of 40 km / h and the second half at 60 km / h. What is the total distance he travelled?
(A) 384 km
(B) 768 km
(C) 576 km
(D) 960 km
It takes 53 seconds to cross a pole at the end of a 110-meter-long train with a speed of 36 km / h. Find the initial distance of the pole from its front end.
(A) 530 meter
(B) 420 meter
(C) 1798 meter
(D) 640 meter
Two train of length 100 meter and 80 meter respectively run on parallel lines of rails. When running in the same direction the faster train passed the slower one in 18 second, but when they are running in opposite directions with the same speed as earlier, they pass each other in 9 seconds. Find the speed of each train.
(A) 20 m/sec, 15 m/sec
(B) 5 m/sec, 15 m/sec
(C) 20 m/sec, 25 m/sec
(D) 30 m/sec, 15 m/sec
A 450 meter long train crosses a bridge 650 meters long in 36 seconds. What is speed (in km/hr) of the train?
(A) 125
(B) 150
(C) 110
(D) 95
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