Ask your own question, for FREE!
Mathematics 65 Online
OpenStudy (anonymous):

Terry Tortoise and Rabby Rabbit are best friends. Their home is 150 km apart. One day, they decided to meet. So Terry and Rabby started walking and running respectively towards each other at uniform speed at 9 am and they meet each other at 3:48 pm in the afternoon. Rabby runs at a speed 24 km/hr and stopped to take a nap after every 12 km He takes a nap for 15 minutes. Had Rabby made the journey without taking rest, they would have met 108 minutes earlier.

OpenStudy (anonymous):

what would be the speed of Rabby after taking nap, is it 18 km/hr

OpenStudy (anonymous):

he runs 12 km in the first half an hour and then rests for 15 minutes. so after the rest he has run 12 km in 45 mins so his speed for first 12 km = 12 / 3/4 = 16 km / hr. is that what u want?

OpenStudy (anonymous):

hi, yes, so his speed would now be 16 km/hr? right

OpenStudy (anonymous):

yes - his average speed over the first 45 minutes is 16 km / hour. when he starts running again it will be at 24 km/hr again

OpenStudy (anonymous):

Also, cannt it be considered, as every 15 mintues he runs 6 km/hr

OpenStudy (anonymous):

so in 1 hour it comes to 18 km/hr

OpenStudy (anonymous):

15 minutes rest considered

OpenStudy (anonymous):

no - you cannot add speeds because speed is a ratio: distance / time. you have to consider the total distance and the changed time (in this case the time has changed). It is valid to add distances and times but not speeds. People often fall into this trap.

Can't find your answer? Make a FREE account and ask your own questions, OR help others and earn volunteer hours!

Join our real-time social learning platform and learn together with your friends!
Latest Questions
rose12345: hellp
8 minutes ago 3 Replies 0 Medals
vennii2taxcked: Go follow my insta @_mrs.tooflyyy
1 hour ago 2 Replies 0 Medals
rose12345: what is the genotype ratio for this cross?
1 hour ago 6 Replies 1 Medal
DemonKinge: anybody hea white?
1 hour ago 1 Reply 0 Medals
DemonKinge: I just found out I'm gay
1 hour ago 10 Replies 1 Medal
DemonKinge: who's gotta big gyatt lmao
1 hour ago 2 Replies 0 Medals
rose12345: What is the genotype ratio for this cross?
1 hour ago 3 Replies 0 Medals
Can't find your answer? Make a FREE account and ask your own questions, OR help others and earn volunteer hours!

Join our real-time social learning platform and learn together with your friends!