An amphibious tank can move on tracks on land at a speed of 70 km / h and swim at a speed of 10 km / h.
| December 11, 2020 | education
An amphibious tank can move on tracks on land at a speed of 70 km / h and swim at a speed of 10 km / h. How long will it take this tank to cover a total distance of 61 km if there is a lake 5 km wide on the way?
Find the distance traveled by land:
61-5 = 56 km
Let’s find the time to travel by land:
56/70 = 0.8 hours
Let’s find the time to move on the water:
5/10 = 0.2 hours
Let’s find the total travel time:
0.2 + 0.8 = 1 hour
Answer: 1 hour
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