Question

A driver travels 300 km in 5 h and 25 min.
What is his average speed in (a) km/h, and (b) m/s?

Answer 1

dear,here is your answer

1) average speed =Total distance traveled/total time taken

now, time= 5h25min=5h+25/60h=5h+0.146h=5.146hours (here I converted 25min to hours)
average speed=300/5.146=58.29 km/h

2}To convert km/h to m/s you need to multiply 5/18 m/s

58.29 of 5/18=58.29*5/18 (her * indicates multiplication).

=16.19 m/s

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Answer 2

$distance = 300km \\ time = 5h \: 25min = 5h + \frac{25}{60} h = 5 + \frac{5}{12} = \frac{65}{12} h \\ speed \: = \frac{distance}{time} = \frac{300}{ \frac{65}{12} } = \frac{300 \times 12}{65} = 55.3846kmph \\ = 55.385kmph \\ speed \: in \: mps = 55.385 \times \frac{1000}{3600} \\ 55.385 \times \frac{5}{18} = 15.3847mps \\ = 15.385mps$