৫৩৬৯১
An error 2% in excess is made white measuring the side of a square. The percentage of error in the calculated area of the square is:
উত্তর
4.04%
৫৩৬৯২
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
৫৩৬৯৩
A boat can travel with a speed of 13 km /hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 68 km downstream.
উত্তর
4 hours
৫৩৬৯৪
A student multiplied a number by 3/5 instead of 5/3 , What is the percentage error in the calculation?
উত্তর
64%
৫৩৬৯৫
A car covers four successive 7 km distance at speeds of 10 km/hr, 20 km/hr, 30 km/hr and 60 km/hr , respectively. Its average speed over this distance is:
উত্তর
20 km/hr
৫৩৬৯৬
A dishonest milkman professes to sell his milk at cost price but he mixes it with water and there by gains 25%. The percentage of water in the mixture is:
উত্তর
20%