Question

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Questions 5a​

Answer 1

Step-by-step explanation:

given, distance = 51 km,i.e 51000m

time = 3 hours,i.e 10800seconds

by formula, speed = distance upon time,

51000/ 10800 m/s

= 4.72.. m/s

Answer 2

Answer:

8.5km

Step-by-step explanation:

Given: Distance= 51 km

Time= 3 hours

​Therfore speed = Distance/Time

                               = 51/3

                               = 17km/h

Now,  

Time (t) = 30 minutes  

                 = 30/60h  

                 = 1/2h

Speed = 17km/hr

Distance travelled = Speed x Time  

                                     = 17 x 1/2 = 8.5km