1Â year, 5Â months ago
1Â year, 5Â months ago
p's efficiency - 16.66% work/hr
q's- 14.28%
r's- 7.14%
p+q+r for 2 hrs = (16.66+14.28+7.14)*2= 76.16% in 2 HOURS
q left 20 min before therefore r worked for last 20mins - 7.14*20/60+=2.38% in 20 MINS
remaining work was done by all three i.e- 100 - 76.16 - 2.38= 21.46% of work done in 1HOUR, ADD THESE TIME TOGETHER- 3HR 20 MINS//