send mail to firstname.lastname@example.org mentioning your email id and mobileno registered with us! if details not recieved
Resend Opt after 60 Sec.
Please verify your mobile number
Subscribe to Notifications
Stay updated with the latest Current affairs and other important updates regarding video Lectures, Test Schedules, live sessions etc..
Refer & Earn
My Abhipedia Earning
Kindly Login to view your earning
A boat takes 12 hours to cover 64 km downstream and 8 hours to cover 32 km upstream. Then the speed of the boat in still water is:
Distance covered in downstream = 64 km
Time taken in downstream = 12 hours.
Rate of downstream = distance / time = a = 64 km / 12 hours = 16 / 3 km/hr.
Distance covered in upstream = 32km
Time taken in upstream = 8 hours.
Rate of upstream = distance / time = b = 32km / 8 hours = 4 km/hr.
Speed in still water = (a + b) / 2 = (1/2)(16/3 + 4) km/hr
= (1/2)(28/3) = 14/3 km/hr.
By: Amit Kumar ProfileResourcesReport error
Access to prime resources