Suggested Answer
10 Km.S= SpeedD= distance T= timeS= d/tbut since you are solving for "d" the equation is d=st so you plug in 10 km/h for speed and 2.1 hours for time and just multiply them. The hours cancel out so you are left with 10km.
Suggested Answer
um I think you need to multiply 10 km by 2.1