A man can cross a downstream river by steamer in 40 minutes and same by boat in 1 hour. If the time of crossing Upstream by streamer is 50% more than downstream time by steamer and the time required by boat to cross same river by boat in upstream is 50% more than time required by in downstream. What is the time taken for the man to cross the river downstream by steamer and then return to same place by boat half the way and by steamer the rest of the way?

Downstream (steamer) = 40 minDownstream (boat) = 60 minUpstream (steamer) = 60 minUpstream (boat) = 90 minRequired time = 40 + 30 + 45 = 115 minutes