Question

pls help me for this question​

Answer 1

Answer:

80 km/h

Step-by-step explanation:

Total distance to be covered= 75 Km

Her class to be started at 9:00 am and she left at 7:45 am and must be arrived there 15 minutes before the class start.

It means total time = 1 hour = 60 minutes

$in \: first \: situation \: she \: drove \: at \: the \\ \: speed \: of \: 70 \: kmph \: for \: 30 \: minutes \: ( \frac{1}{2} \: hour) \\ distance \: = \: speed \: \times time \\ distance = \: 70 \times \frac{1}{2} \: km = 35 \: km \\ total \: distance \: to \: be \: covered = 75 - 35 \: km \\ = \: 40 \: km \\ \: in \: next \: situation \: \\ distance \: = \: 40 \: km \\ time \: = 30 \: mins = \frac{1}{2} \: hour \\ speed = \frac{distance}{time} \\ = \frac{40}{ \frac{1}{2} } \\ = 40 \times \frac{2}{1} \\ = 80 \: kmph$

hope it helps you

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