Quantitative Aptitude
A boat can travel 42 km in 6 hours while going upstream. If the speed of the stream is 2 km/h, then bow much distance will the boat cover in 12 hours while going downstream?
A can do a work in 10 days and B can do the same work in 15 days. If they work on it together for 4 days, then the fraction of the work that is left is:
P starts from A at 6 a.111. and reaches B after 8 hours. Q stat1s from B at 8 a.m. and reaches A after 9 hours. When they meet, what is the ratio of the distance travelled by Q to the distance travelled by P?