The relative speed of the faster train is= (50 - 30) km/hr

                                                       = 20 km/hr

                                                       = 20*1000/3600 m/s

Now,

The faster train travels in 1 second = 20*1000/3600 m

The faster train travels in 18 seconds= 20*18*1000/3600 m

               &nb 

The boat travels upstream in 90 minutes = 3 miles

The boat travels upstream in 60 minutes = 3*60/90 miles

                                                         = 2 miles

Thus, Speed of Boat - Speed of Current = Upstream Speed of boat

or, Speed of Boat - 2 = 2

or, Speed of Boat = 2+2

or, Speed of Boat  = 4 miles/hour

Now,

Upon Returning,

The Boat travels Downstream,

Whereas,

Downstream speed of Boat = Speed of Boat + Speed of Current

                            &n 

UNFPA=United Nations Population Fund. 

Headquarters: New York City, USA

Tub's total capacity = 12 gallon. Question dictates Tub has 3 gallons already filled up. So we have to find out what time it takes to fill up rest 9 gallon (12-3) considering the faucet and drain.

As given for faucet, it takes 1 min to fill up 3 gallons

and it takes 1 min to drain 1.5 gallons.

So within 1 min the tub actually fills 1.5 gallons (3-1.5)

Now 1.5 gallons are filled up in 1 min

         1 gallon is filled up in 1/1.5 min

 so    9 gallons are filled up in (1/1.5) *9 mins = 6 mins (ANS)

Fiaz father has 5 sons.

4 sons are Ten, Twenty, thirty, forty.

Last the 5th son is Fiaz himself.

Given that, 4y-3x = 5

=> y = (5+3x)/4

As per condition in the questions y would be > 100

that means, (5+3x)/4 > 100

=> 5+3x > 400

=> 3x > 395

=> x > 395/3 = 131.66666 ~ 132

So the smallest integer value of x would be 132 for which y >100

Total card =52

Total suit = 4

After drawing first card the remining total card is 51 and remaining total card of same suit is 12.

So probability of getting second card of same suit is 12/51 without replacement. None is the answer.

MAy be question is not clear or wrong.

Hours can not be in %.

Question is not correct.

Current average = M

Total Mark is 100

So the new average is (100+M)/2 = 50+M/2

Total loss >BDT 200

Let themale student be 100. Then french speaking males are 50.

Therefore the girls students would be (3/4)*100 = 75 and French speaking girls student would be 75 * (2/3) = 50

Now, Total students = 175

Total french spoken student = 100

so fraction of entire class who speaks french is 100/175 = 4/7