In a church choir loft, two parallel walls are 5.21 m apart. The singers stand against the north wall. The organist faces the south wall, sitting 0.809 m away from it. So that she can see the choir, a flat mirror 1.415 m wide is mounted in the south wall, straight in front of the organist. What width of the north wall can she see? Answer in units of m.

The fertilized egg  begins to develop into a hollow ball of cells called the blastocyst. 

Distance covered = speed x timethe distance traveled going against the stream = distance traveled with the stream.therefore it is the speed and the time that are the variables.as he travels the same distance both ways, speed x time is the same for each way.going upstream his speed is 4 kph; going downstream his speed is 6 kph.therefore we have two simultaneous equations: time upstream x 4 = time downstream x 6time upstream + time downstream = 60 minutestherefore we have the equation: time upstream = 6/10 hour, time downstream therefore = 4/10 hour.distance traveled at 4km/hr in 6/10 hour = 24/10 = 2.4km.check: distance traveled at 6km/hr in 4/10 hour = 24/10 = 2.4km.

The inference is supported by evidence in the graph is this is an exothermic reaction where the total release of energy equals a + c.