A man can row a boat 10 km/hr in still water. When the speed of the stream is 4 km/hr, it takes 30 hours to row to a certain place and come back. How far is the place ?

Two trains start at the same time from Delhi and Pune and proceed towards each other at the rate of 80 km/h"1 and 90 km/h"1 respectively. When they meet, it is found that one train has travelled 200 km more than the other. Find the distance between Delhi and Pune.

It takes 20 hours for a man to complete a journey by a car. If he drives the first half at the speed 60 kmh"1 and the second half at 40 kmh', what is the total distance ?

A boy buys an item with 40% discount on the labelled price. He sold that item with 35% profit on the labelled price. What was his per cent profit on the price he bought ?

The wages for 40 women amount to Rs 3200 in 24 days. How many men must work for 15 days to receive Rs 4800? The daily wages of a man is double that of a woman.