১২৩৩১
A motor-cycle covers 40 Km with a speed of 20 km/hr. Find the speed of the motor- cycle for the next 40 km journey so that the average speed of the whole journey will be 30 km/hr.
উত্তর
60 km/hr
১২৩৩২
A man can row 6 km/hr in still water. It the speed of the current is 2 km/hr, it takes 3 hrs more in upstream than in the downstream for the same distance. The distance is _____
উত্তর
24 km
১২৩৩৪
A sum of money amounts to Tk 9800 after 5 years and Tk. 12005. after 8 years at the same rate of simple interest. The rate of interest per annum is -
উত্তর
12%
১২৩৩৫
The price of raw materials has gone up by 15%, labor cost has also increased from 25% of the cost of raw material to 30% of the cost of raw material. By how much percentage should there be reduction in the usage of raw materials so as to keep the cost same?
উত্তর
17%
১২৩৩৬
The number of students in 3 classes is in the ratio 2:3:4. If 12 students are increased in each class this ratio changes to 8:11:14. The total number of students in the three classes in the beginning in the three classes in the beginning was:
উত্তর
162