Question

two places are 240 kms apart two boats starts from both placea at same time towards each other if one boat is going in downstream and other one is going to upstream then after how much time will they meet each other if their speeds are 13 kmph and 11 kmph​

Answer 1

Sorry don't know this answer

Answer 2

let their time of meet be 't'

let 1st boat meet at 'x' distance from its starting point,then

2nd boat meets at (240-x) distance from its starting point

[since both are 240km apart]

Upstream boat velocity = u-v

Downstream boat velocity = u+v

given,

u+v=13

u-v=11

we know that,

velocity=distance/time

Downstream boat

u+v=x/t

13=x/t

x=13t------------------(1)

Upstream boat

u-v=(240-x)/t

11=(240-x)/t-------(2)

put eq(1) in eq(2)

we get t=10hrs

hence after 10hr both boths meet..