a car travel 30 km at a uniform speed of 40 kn/h and the next 30km at a uniform speed of 20km/h. find its average speed.
Answers
ANSWER:
26.66 km/ hr
EXPLANATION:
given that ,
given that , 1st 30 km uniform speed is (u1) = 40 km/h
given that , 1st 30 km uniform speed is (u1) = 40 km/h 2nd 30 km uniform speed is ( u2 ) = 20 km/h
given that , 1st 30 km uniform speed is (u1) = 40 km/h 2nd 30 km uniform speed is ( u2 ) = 20 km/h total distance ( d ) = 30 + 30 = 60 km
given that , 1st 30 km uniform speed is (u1) = 40 km/h 2nd 30 km uniform speed is ( u2 ) = 20 km/h total distance ( d ) = 30 + 30 = 60 km time taken in 1st time = d / t = 30/40 also, 3h / 4 = 180/4 = 45 min
given that , 1st 30 km uniform speed is (u1) = 40 km/h 2nd 30 km uniform speed is ( u2 ) = 20 km/h total distance ( d ) = 30 + 30 = 60 km time taken in 1st time = d / t = 30/40 also, 3h / 4 = 180/4 = 45 min tim taken in 2nd time = d/t = 30/20 also, 3h/2 = 180/2 = 90 min
given that , 1st 30 km uniform speed is (u1) = 40 km/h 2nd 30 km uniform speed is ( u2 ) = 20 km/h total distance ( d ) = 30 + 30 = 60 km time taken in 1st time = d / t = 30/40 also, 3h / 4 = 180/4 = 45 min tim taken in 2nd time = d/t = 30/20 also, 3h/2 = 180/2 = 90 min total time = 45 + 90 = 135 min = 135/60 h
given that , 1st 30 km uniform speed is (u1) = 40 km/h 2nd 30 km uniform speed is ( u2 ) = 20 km/h total distance ( d ) = 30 + 30 = 60 km time taken in 1st time = d / t = 30/40 also, 3h / 4 = 180/4 = 45 min tim taken in 2nd time = d/t = 30/20 also, 3h/2 = 180/2 = 90 min total time = 45 + 90 = 135 min = 135/60 hav.speed = 60/135/60 = 60 * 60 /135 = 26.66 km/h ( answer )
