Question

a Boat covers 32 km upstream and 36 km downstream in 7 hours. it covers 40 km upstream and 48 km downstream in 9 hours. class 10th RD Sharma pair of linear equations in two variables ​

Answer 1

Answer:

solve the equation given above u will get the answer

Explanation:

let the speed of boat and stream be X and Y km/hr.

speed at upstream=(X-Y)km/hr

speed at downstream=(X+Y)km/hr

Now,time taken to cover 32km upstream=32/(X-Y)

time taken to cover 36km downstream=36/(X+Y)

consider, 1/X-Y=p and 1/X+Y= q

Answer 2

Answer:

Newton's first law states that, if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force. This postulate is known as the law of inertia.