The electric train on its way passes two tunnels: the length of the first of them is 15 km 160 m, the second – 9 km.
| September 15, 2021 | education
The electric train on its way passes two tunnels: the length of the first of them is 15 km 160 m, the second – 9 km. How long does it take to complete the first tunnel if it took 21 minutes to complete the second tunnel? The length of the train is 240 m
Let’s convert time into hours. 21 minutes = 21/60 hours.
Add the length of the electric train to the length of the second tunnel.
S2 = 9 + 0.24 = 9.24 km.
Let’s determine the speed of the electric train.
V = S2 / t2 = 9.24 / (21/60) = 26.4 km / h.
Add the length of the electric train to the length of the first tunnel.
S2 = 15.16 + 0.24 = 15.4 km.
Let’s determine the time of passage of the first tunnel.
t1 = S1 / V = 15.4 / 26.4 = 35/60 hours.
t1 = 35 minutes.
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