১২০৬১
A man takes 3 hours 45 minutes to row a boat 22.5 km downstream of a river and 2 hours 30 minutes to cover a distance of 10 km upstream . Find the speed of the river current in km /hr.
উত্তর
1 km/hr
১২০৬২
A man can row 6 km/hr in still water. If 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
১২০৬৩
A train 150m long passes a pole in 15 seconds and crosses another train of the same length travelling in opposite direction in 8 seconds. The speed of the second train in (km/h) is -
উত্তর
99 km/hr
১২০৬৪
The ratio of the speeds of a train and a man 6 : 1 . The length of the train is 650 m and crosses a pole in 1 minute 5 seconds. In how much time will the man cross the 240 m long platform?
উত্তর
2 min 24 sec
১২০৬৫
If the numerator of a fraction is increased by 150% and the denominator of a fraction increased by 200% fraction becomes 10/19. Find the fraction.
উত্তর
12/19
১২০৬৬
A number when divided by 627 leaves a remainder 43. By dividing the same number by 19 , the remainder will be__
উত্তর
5
১২০৬৭
A can finish a work in 5 days and B takes 4 days to do the same work. If the work is increased by 8 times, how many days will it take for both of them to finish the work if they work together?
উত্তর
20 days
১২০৬৮
A computer can perform 30 identical tasks in 6 hour. At that rate, what is the minimum number of computers that should be assigned to complete 80 of the tasks within 3 hours?
উত্তর
6
১২০৬৯
A and B together can complete a piece of work in 12 days, B and C can do it in 20 days and C and A can do it in 15 days. A, B and C together can complete it in-
উত্তর
10 days
১২০৭০
There are 15 boys and 10 girls in a class. If three students are selected at random, what is the probability that 1 girl and 2 boys are selected?
উত্তর
21/46