A and B take part in 100 m race. A runs at 5 kmph. A gives B a start of 8 m and still beats him by 8 seconds. The speed of B is:

5.15

kmph

No worries! We‘ve got your back. Try BYJU‘S free classes today!

4.14

kmph

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

4.25

kmph

No worries! We‘ve got your back. Try BYJU‘S free classes today!

4.4

kmph

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is C $4.14$ kmph
Speed $= \frac{D i s t a n c e}{T i m e T r a v e l l e d}$
$\Rightarrow$ A's Speed $= 5 k m p h = \frac{100 m}{T i m e T r a v e l l e d}$
$\Rightarrow$ Total time taken by A to complete $100 m = \frac{100}{(5 \times 1000 / 3600)} s e c o n d s = 72 s e c o n d s$
$\Rightarrow$ B's Speed $= \frac{D i s t a n c e T r a v e l l e d b y B}{T i m e T a k e n b y B} = \frac{(100 - 8) / 1000}{(7 + - 8) / 3600} k m p h = \frac{92 \times 36}{800} k m p h = 4.14 k m p h$

Suggest Corrections

Similar questions

C and D take part in 200 m race. C runs at 10 kmph. C gives D a start of 16 m and still beats him by 16 seconds. The speed of D is:

M & N are two towns. A person covers the distance from M to N on cycle at 8.5 kmph and returns to M by a ferry running at a uniform speed of 4 kmph. What is his average speed for the whole journey?

A takes 3 hours more than B to walk 30 km. If A starts jogging at a speed twice his walking speed, he takes 2 hours less than B. Find the speed of A.

A sports car covers a distance in 100 min, if it runs at a speed of 96 kmph on an average. The speed at which the car must run to reduce the time of journey to 80 min will be

A person walks at 10 kmph for 3 hrs and at 8kmph for 6 hrs. What is the average speed?

Join BYJU'S Learning Program

A and B take part in 100 m race. A runs at 5 kmph. A gives B a start of 8 m and still beats him by 8 seconds. The speed of B is:

The correct option is C 4.14 kmphSpeed =DistanceTime Travelled⇒A's Speed =5kmph=100mTime Travelled⇒Total time taken by A to complete 100m=100(5×1000/3600)seconds=72 seconds⇒B's Speed=Distance Travelled by BTime Taken byB=(100−8)/1000(7+−8)/3600kmph=92×36800kmph=4.14 kmph