A man can cross a downstream river by steamer in 40 minutes and same by boat in 1 hour. If the time of crossing the river in upstream direction by steamer is `50%` more than downstream time by then steamer and the time required by boat to cross the same river by boat in upstream is `50%` more than the time required in downstream by boat. What is the 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 reat of the way?

Answer

115 min