১০৬২৭
A and B can do a work in 12 days. B and C can do it in 15 days. A and C can do it in 20 days. If all of them work together, in how many days can they finish the work?
উত্তর
10
১০৬২৮
10 men survive 24 days on 15 cans of food. How many cans are needed for 8 men to survive 36 days?
উত্তর
18
১০৬২৯
Two trains are running in opposite directions with the same speed. If the length of each train is 120 meters and they cross each other in 12 seconds, then the speed of each train (in km/ hr ) is
উত্তর
36
১০৬৩০
A train, 150 meter long and running at a speed of 60 km per hour, takes 30 seconds to cross a bridge. What is the length (in meter) of the bridge?
উত্তর
350