RRB Group-D Model Paper 16 with answers for online practice

Question : 83 of 100

Marks: +1, -0

Pipe A empties a cistern in 16 hours and pipe B empties the same cistern in 20 hours. When the cistern is full, if both the pipes were left opened and closed after 8 hours, what part of the cistern remained filled after 8 hours?