Public transport

Determine how many minutes it took each public transport vehicle to travel along its route.
The bus set off on its route at 9:47. , it reached its destination at 10:35.
The trolleybus set off on its route at 9:38. , it reached its destination at 10:20.
The tram covered its route in 54 minutes. It arrived at its destination at 10:49. At what time did it set off on its route?

Result

a =  48 min
b =  42 min
c = 9:55

Step-by-step explanation:

$a=10\cdot 60+35-(9\cdot 60+47)=48\text{min}$

$b=10\cdot 60+20-(9\cdot 60+38)=42\text{min}$

$c=10+\frac{49}{60}-\frac{54}{60}=9.91667=9:55$

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