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notsponge [240]
3 years ago
10

If a train travels m miles in h hours and 45 minutes, what is the average speed in miles per hour ?

Mathematics
2 answers:
tangare [24]3 years ago
5 0
Speed = (distance covered) / (time to cover the distance).

Time = 'h' hours and 45 minutes.
45 minutes is 3/4 of an hour. (or 0.75 hour)
Total time is (h + 0.75) hours.

Speed = 'm' / (h + 0.75)

That's choice-'a'.
Brut [27]3 years ago
3 0
s=m \ miles\\
t=h \ hours \ 45 \ min=h+0.75 \ hours\\
v=\frac{s}{t}\\
v=\frac{m}{h+0.75} =\frac{m}{h+\frac{3}{4}} \Rightarrow A


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