apptitude test no:2

India
November 30, 2006 10:05pm CST
1)A bacteria splits in half after 20 minutes, so that after 20 minutes there are 2 bacteria, and after 40 minutes there are 4 bacteria. How many bacteria will there be after 1 hour and 20 minutes? 2)A car travels from A to B at a speed of 40 mph then returns from B to A at a speed of 60 mph. What is the average speed for the round trip?
1 response
medooley
@medooley (1873)
• United States
1 Dec 06
Hmmm, these are fun... 1. 16 2. 50 mph Am I right?
msvraghavan2003
@msvraghavan2003 (137)
• India
1 Dec 06
answer 1 is correct amnswer 2 is 48mph
medooley
@medooley (1873)
• United States
1 Dec 06
Can you explain on how you come up with 48? 50 was a guess for me... I couldn't figure it out.