Question

Две моторные лодки отошли от пристани одновременно в противоположном направлении,через 3 часа растояние между ними стало 66км,найди скорость первой лодки если скорость второй 17 км в час

Answer 1

1)14*3=42км прошла первая лодка за 3 часа

2)87-42=45км прошла вторая за 3 часа

3)45/3=15км/ч скорость второй лодки

через 4 часа

1)(14+15)*4=116 км расстояние между лодками

через 5часов

1)(15+14)*5=145км расстояние между лодками

Answer 2

Problem Analysis

We are given that two motorboats departed from a pier simultaneously in opposite directions. After 3 hours, the distance between them became 66 km. We need to find the speed of the first boat, given that the speed of the second boat is 17 km/h.

Solution

Let's assume the speed of the first boat is x km/h.

Since the boats are moving in opposite directions, the distance covered by the first boat in 3 hours is 3x km.

Similarly, the distance covered by the second boat in 3 hours is 3 * 17 km.

The total distance between the two boats after 3 hours is 66 km.

Using the formula: distance = speed * time, we can set up the equation:

3x + 3 * 17 = 66

Simplifying the equation:

3x + 51 = 66

3x = 66 - 51

3x = 15

x = 15 / 3

x = 5

Therefore, the speed of the first boat is 5 km/h.

Answer

The speed of the first boat is 5 km/h.