১৯১৪১
Pipe A can fill a tank in 20 hours and Pipe B can fill it in 30 hours. Working together, how long will they take?
উত্তর
12 hours
১৯১৪৪
HCF of two numbers is 11 and their LCM is 693. If one number is 77, find the other.
উত্তর
99
১৯১৪৫
A man covers 60 km at 20 km/hr and another 60 km at 30 km/hr. Average speed for whole journey is:
উত্তর
24 km/hr