Answer:

122.4 km/h is the answer.

Explanation:

35 m/s = (35/1000)/(1/60 x 60) km/h

            = (0.034 x 60 x 60)km/h

            = 122.4 km/h

126 km /h

explination;

As 1000m = 1 km and m is in numerator so to cancel that divide you 35m/s with 1000m and finally multiply it with 3600 coz in 1 hour there are 3600s and seconds in your questions is in denominator so to cancel that multiply it.