a man can row 2 kilometre upstream in 20 minutes and can return in another 15 minutes . His average speed for the entire journey is what
Answers
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His average speed in the total journey is 7 km/hr.
Given data :
The man covers a distance of 2 kilometres in the time of 20 minutes in the upstream.
The man covers a distance of 2 kilometres in the time of 15 minutes in the downstream.
• So,in the upstream :
He covers in 20 minutes = 2 km
He covers in 1 minute = 2/20 km
He covers in 60 minutes = 2×60/20 = 6 km
So,his speed in the upstream = 6km/hr
• Now,in the returning
He covers in 15 minutes = 2 km
He covers in 1 minute = 2/15 km
He covers in 60 minutes = 2×60/15 = 8 km
So, his speed in returning = 8 km/hr
• Now,we have to calculate the average speed of the entire trip by using the following formula :
Average speed = total speed/total round of trip = (6+8)/2 = 7 km/hr (answer)