★ ELLO ★ here is your ANSWER !! a ) a bus TRAVELLING 50 km in 45 second !! 50 km / 45 min => 10 / 9 km / min . b ) to calculate in meter / second. !! we need to divide 45/60 to convert it into second !! now , look this attachment !! hence , the answer is. 20 .74 m / s hope it helps you dear !!
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