 Related Questions Latest Answer : 30 is the answer becoz average should be done by adding all and divide it by number of laps.. ... Speed of boat in still water 10 kmph.If the boat takes 24hr in up stream and 16hr in down stream to cross the same distance, then what will be the distance covered. One person traveled 4 laps with the speed of 10,20,40 ( or 30) and 60 kmph and what is the average speed. 20 Like one student takes 20 mins if he goes with speed 15kmph and at what speed he should go to reach in 15 mins ( nos are not same) Speed of boat in still water is 10kmph.If it travels 24km downstream,16km upstream in the same amount of time, what is the speed of the stream?(a)3kmph(b)3.5kmph(c)2kmph In a class the average age is 16yrs.if the teacher who is 40 yrs of age is also included ,the average becomes 17yrs,how many students were there? 20kmph Latest Answer : Let x be the distance and
y be the average speed
x/10+x/20+x/30+x/40=4x/y
24x/120=4x/y
y=120/6
y=20kmph ... One student takes 20 mins to reach school if he goes at a speed of 15kmph .At what speed should he go to reach in 15 mins ( nos are not same) If a car starts from A towards B with some velocity due to some problem in the engine after traveling 30km.If the car goes with 4/5 th of its actual velocity the car reaches B 45min later to the actual time. If the car engine fails after traveling 45km, the car reaches the destination B 36min late to the actual time , what is the initial velocity of car and what is the distance between A and B in km 20 & 130 The average salary of 3 workers is 95 Rs. per week. If one earns Rs.115 and second earns Rs.65 how much is the salary of the 3rd worker. 105
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