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Plz solve this.

two trains of lengths 200m and 100m enters a tunnel a length 300m from opposite ends at the same time on parallel tracks.speed of two trains are 36kmph and 18kmph after how much time (in sec) from the instant the two trains enter the tunnel will the tunnel be free of traffic again. explanation?

two trains of lengths 200m and 100m enters a tunnel a length 300m from opposite ends at the same time on parallel tracks.speed of two trains are 36kmph and 18kmph after how much time from the instant the two trains enter the tunnel will the tunnel be free of traffic again

everyday a mango seller sells half of his stock,10% of the stock overnight gets spoiled.if 1983 mangoes rotted over 3 nights then how many did he start with on the first day ?

A;25,000

B:24,000

C;30,000

D;32,000

can please anybody help me out on this ?

Alloy A has 80% copper and 20% tin. A certain process when applied repeatedly to the alloy decreases the copper quantity in the alloy by one-fifth and the tin quantity in it by one-tenth, each time it is applied. The minimum number of times the process must be applied so that the concentration of copper in the alloy is less than 70% is ____.

a)4

b)5

c)3

d)2

A train after travelling 50km meets with an accident and then proceeds 3/4 its former speed and arrives at its destination 35 minutes late.Had the accident occurred 24km further, it would have reached the destination only 15 minute late.the normal speed of the train is.

explain

A and B run around a circular track of length 510m,starting from same point,simultaneously and in the same direction.A who runs faster laps B in the middle of the 5th round.If A and B were to run a 3km long race,how much start,in terms of distance,should A give to B so that they finish the race in dead heat.?

oa:666.66m

please explain

A can comple a piece of work in 60 days , B in 30 days ,c in 20 days , D in 15 days , E in 12 days and F in 10 days.Now these six people make two groups , one of 2 member and the other of 4 members , in such a way that one team take twice the time to complete the work as compared to other.How many such pair of group are possible?

Two friends A &B decided to run in a track.The speed of A=25% more than B.If a B give a head start of 7m.what was the lenght of the track?

79:21