২৭৩৪২
A boat covers a certain distance downstream in 1 hour, while it comes back in 1.5 hour. If the speed of the stream be 3 km/hr. What is the speed of the boat in still water?
উত্তর
15 km/hr
২৭৩৪৩
How many liters of a 90% of concentrated acid needs to be mixed with a 75% Solution of concentrated acid to get a 30 liter Solution of 78% concentrated acid?
উত্তর
6
২৭৩৪৪
A train traveled on an average speed of 45 km per hour from Dhaka to Chittagong and returned Dhaka from chittagong on an average speed of 36 km per hour. What was the average speed of the train over the whole journey?
উত্তর
40 km. 500 m
২৭৩৪৭
Two cards are drawn together from a pack of 52 cards. The probability that one is a spade and one is a heart , is:
উত্তর
13/102
২৭৩৪৮
The price of a loaf of bread was increased by 20%. How many that used to buy 300 loaves/
উত্তর
250
২৭৩৪৯
Out of 80 children , 35% can play only cricket , 45% , can play only table tennis and remaining children can play both the games. In all, how many children can play cricket?
উত্তর
44